Attachment: PDF QuickBooks callback lure

calendar Nov 13, 2026  ยท
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Detects inbound messages containing a PDF attachment that matches a YARA signature identifying a QuickBooks-themed callback phishing lure.

Sublime rule (View on GitHub)

 1name: "Attachment: PDF QuickBooks callback lure"
 2description: "Detects inbound messages containing a PDF attachment that matches a YARA signature identifying a QuickBooks-themed callback phishing lure."
 3type: "rule"
 4severity: "medium"
 5source: |
 6  type.inbound
 7  and any(filter(attachments, .file_type == "pdf"),
 8          any(file.explode(.),
 9              any(.scan.yara.matches,
10                  .name == "pdf_quickbooks_toad_lure_blank_page"
11              )
12          )
13  )  
14attack_types:
15  - "Callback Phishing"
16tactics_and_techniques:
17  - "PDF"
18  - "Impersonation: Brand"
19  - "Social engineering"
20detection_methods:
21  - "File analysis"
22  - "YARA"
23id: "627841ce-7ceb-5f46-8103-a99237037eea"
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