Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cdbd85a267f702…

MALICIOUS

PDF

11.9 KB Created: 2021-10-13 13:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c20d731d87311fe0e35bad573f0cfe8d SHA-1: adce9f9ac97bb1ae6ad849c426b4fa74ac52e9e3 SHA-256: 31cdbd85a267f702937160b10ca581ceff6c247ed1443d2bb955a065a39a1857
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as an image-only lure, typical of phishing campaigns, with heuristics indicating a deceptive host link. The embedded URL, http://yughlbwlrchenbew.updt644-serv1ce.info, is the primary indicator of malicious intent, likely leading to a credential harvesting or malware distribution site. No scripts were extracted, limiting the analysis to the document's deceptive structure and the single malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.1386

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 1 image(s), only 0 text block(s), carries a click-outward action, and is only 11 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://yughlbwlrchenbew.updt644-serv1ce.info PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A 14372 bytes
SHA-256: 073803de7bb0ddea89e919c39ebbdd6fe2ca9b61d7ca1b42d428683bb9a47022

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