Malicious PDF — malware analysis report

Static analysis result for SHA-256 e245b9398032593b…

MALICIOUS

PDF

18.3 KB Created: 2021-08-24 19:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 95e20ce24634981fa4e82ba93b161983 SHA-1: c5c01fe437e2b048575b180d63765714a73ce93f SHA-256: e245b9398032593b2b2d8bb0626ecd2cb66a0731f8be9265d0f1bf86541f9cba
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, with a deceptive host link. The heuristic PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK specifically flags the link http://vkurdyumova.updta78-serv1ce.info as belonging to a typosquat domain. While no scripts were directly extracted, the PDF structure itself contains an embedded URI action pointing to this malicious domain, suggesting an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0577

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 18 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://vkurdyumova.updta78-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_off000035e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35E1 12396 bytes
SHA-256: 9651c78dad64c31681e27aaf77368dfa0aab65a72df78104afb2fc8edab34c59

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