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Create link_concatenated_display_text_pdf_reference.yml #4635

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78b009e
Create link_concatenated_display_text_pdf_reference.yml
D-Bolton Jun 8, 2026
15ebd99
Auto-format MQL and add rule IDs
Jun 8, 2026
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22 changes: 22 additions & 0 deletions detection-rules/link_concatenated_display_text_pdf_reference.yml
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name: "Link: Concatenated display text concealing duplicate URLs with PDF reference"
description: "Detects messages where two identical links are displayed as a single continuous text string, with the second link containing 'PDF' in its display text. This technique can be used to obscure the true nature of links by making them appear as legitimate document references."
type: "rule"
severity: "medium"
source: |
type.inbound
and strings.contains(body.current_thread.text,
strings.concat(body.current_thread.links[0].display_text,
body.current_thread.links[1].display_text
)
)
and body.current_thread.links[0].href_url.url == body.current_thread.links[1].href_url.url
and strings.icontains(body.current_thread.links[1].display_text, 'pdf')
attack_types:
- "Credential Phishing"
tactics_and_techniques:
- "Evasion"
- "Social engineering"
detection_methods:
- "Content analysis"
- "URL analysis"
id: "4cb86869-bb02-5903-bb7b-3cc2f88eb207"
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