Attachment: PDF with specific W-9 lure

calendar Jul 1, 2026  ยท
Share on: linkedin copy

Detects PDF attachments containing W-9 related lures. This one is looking for signatures that have been observed across multiple samples.

Sublime rule (View on GitHub)

 1name: "Attachment: PDF with specific W-9 lure"
 2description: "Detects PDF attachments containing W-9 related lures. This one is looking for signatures that have been observed across multiple samples."
 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 in ("pdf_w9_signature_c003"))
10          )
11  )  
12attack_types:
13  - "BEC/Fraud"
14tactics_and_techniques:
15  - "PDF"
16  - "Social engineering"
17detection_methods:
18  - "File analysis"
19  - "YARA"
20id: "531760d2-f7e5-5fa9-9ccf-e5fbdba2a6a3"
to-top