Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c610b87be262b0…

MALICIOUS

PDF

3.9 KB Created: 2021-10-09 14:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 45427b1ff16eed3ac74e3bcc4d5bb524 SHA-1: 322aa78ed16ee3222386ff15b1e7599a4d1786a8 SHA-256: 74c610b87be262b0aefc3ce846d1f448aec6851088ba8b3420b3dc86a8a67538
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its structure, which consists primarily of images with minimal text, typical of a screenshot disguised as a document. It contains a deceptive URL, http://yughjwwenes.updta78-serv1ce.info, which is likely intended to trick the user into clicking it. The ML classifier also flagged this PDF as malicious, supporting the assessment of its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6659

Heuristics 4

  • Image-only PDF lure links to a deceptive (typosquat) host high PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK
    PDF is image-heavy with little real text and its clickable action targets a host that impersonates a security/service/brand word with a look-alike homoglyph substitution — a digit OR a confusable letter (e.g. 'serv1ce', 'servlce', 'upd4te', 'm1cr0s0ft') — on a domain that is not a known-good site. This is a credential-phishing / fake-update carrier shape: a screenshot-like page funnels the victim to a deceptive look-alike destination.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 3 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 http://yughjwwenes.updta78-serv1ce.info PDF link annotation

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