Attachment: PDF with View RFP Document lure with external link

calendar Aug 27, 2026  ·
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Detects inbound emails containing a PDF attachment that references a 'VIEW RFP DOCUMENT' lure and embeds a URL pointing to a domain that differs from the sender's domain, a pattern consistent with document-based social engineering used to redirect recipients to attacker-controlled infrastructure.

Sublime rule (View on GitHub)

 1name: "Attachment: PDF with View RFP Document lure with external link"
 2description: "Detects inbound emails containing a PDF attachment that references a 'VIEW RFP DOCUMENT' lure and embeds a URL pointing to a domain that differs from the sender's domain, a pattern consistent with document-based social engineering used to redirect recipients to attacker-controlled infrastructure."
 3type: "rule"
 4severity: "high"
 5source: |
 6  type.inbound
 7  and any(filter(attachments, .file_type == "pdf"),
 8          any(file.explode(.),
 9              any(.scan.strings.strings, . =~ 'VIEW RFP DOCUMENT')
10          )
11          and any(file.explode(.),
12                  length(filter(.scan.url.urls,
13                                .scheme != "mailto"
14                                and .domain.domain != sender.email.domain.domain
15                         )
16                  ) > 0
17          )
18  )  
19attack_types:
20  - "Credential Phishing"
21tactics_and_techniques:
22  - "PDF"
23  - "Social engineering"
24detection_methods:
25  - "File analysis"
26  - "URL analysis"
27  - "Content analysis"
28id: "ad4bcc06-059d-5770-8b9b-b7560472d965"
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