Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36b7f83aece4c07…

MALICIOUS

PDF

58.6 KB Created: 2021-04-03 23:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a120dd33fc72677c0b8bafdc1cdea83 SHA-1: ceb5ec8f14af8e013457b49293570764c6009923 SHA-256: d36b7f83aece4c07612bd09ccaf8edb7a11ebb1fca563a2de8a47776b606718e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking an embedded URI. The PDF contains a large number of external links, suggesting a link farm for SEO or to distribute malicious content. The primary malicious URL identified is https://jottigo.ru/award?keyword=adaptive+optics+in+ground+based+telescopes+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9085

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 58 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=adaptive+optics+in+ground+based+telescopes+pdf
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