Malicious PDF — malware analysis report

Static analysis result for SHA-256 924a71c5cac24a9d…

MALICIOUS

PDF

10.8 KB Created: 2021-10-16 09:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f529a32df9d74d31b3b04225d083fe2c SHA-1: c7889f608bf966d21fab6bd6b2abe0fa4354adcc SHA-256: 924a71c5cac24a9d674c085261936bcd6a0d2c4928ff38af0b19f98f6d7077bd
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing attacks, which directs users to a deceptive URL. The heuristic 'PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK' strongly indicates a malicious intent to trick users into visiting a potentially harmful website. The embedded URL 'http://yughexemlcglrls.updt644-serv1ce.info' is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.1321

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 10 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://yughexemlcglrls.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_off000011c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8 14372 bytes
SHA-256: 073803de7bb0ddea89e919c39ebbdd6fe2ca9b61d7ca1b42d428683bb9a47022

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