Malicious PDF — malware analysis report

Static analysis result for SHA-256 953dcb2fa52b98c5…

MALICIOUS

PDF

7.7 KB Created: 2021-10-09 14:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d51fc4d5f70a97f9d7485409f9761f7d SHA-1: 9b2035d44e9d20521b8a0704e37a5a63d99675a4 SHA-256: 953dcb2fa52b98c59b0c27aa57174960e86309ebea8974ee6dd93965649c709a
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file utilizes an image-only lure, a common tactic in phishing campaigns to trick users into clicking deceptive links. The embedded URL, http://yughgeldmwsewm.updt644-serv1ce.info, points to a typosquatting domain, further indicating malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lead the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1832

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 7 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://yughgeldmwsewm.updt644-serv1ce.info PDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5 5192 bytes
SHA-256: a7879a62e1a1a2641241ef468eb466282da88b9d74c16e2d1391a22af244d0c8

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