Attachment: Fake LinkedIn invoice PDF lure

calendar Oct 23, 2026  ยท
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Detects inbound messages containing a PDF attachment that matches YARA signatures identifying fake LinkedIn invoice lures.

Sublime rule (View on GitHub)

 1name: "Attachment: Fake LinkedIn invoice PDF lure"
 2description: "Detects inbound messages containing a PDF attachment that matches YARA signatures identifying fake LinkedIn invoice lures."
 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, .name == "pdf_fake_linkedIn_invoice_lure")
10          )
11  )  
12attack_types:
13  - "BEC/Fraud"
14  - "Credential Phishing"
15tactics_and_techniques:
16  - "Impersonation: Brand"
17  - "PDF"
18  - "Social engineering"
19detection_methods:
20  - "YARA"
21  - "File analysis"
22id: "f4847087-fa7a-5c67-9d32-e595d980bf0d"
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