Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5152450c5c4531…

MALICIOUS

PDF

9.1 KB Created: 2021-10-03 20:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5a8163c583802e0b4b193ff8b6550f29 SHA-1: 3a2337144b3f29c2753280cbf7e094acf1213904 SHA-256: 6b5152450c5c45318dfd53df4bd754b9198718cbd77e36f62b666602ea76e9b7
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a screenshot lure, presenting a deceptive image to trick users into clicking a link. The embedded URL, http://cendeservlce.premmise.ru, is a typosquatted domain, strongly indicating a phishing attempt. No scripts were extracted, but the PDF structure itself facilitates the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1805

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 9 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://cendeservlce.premmise.ru 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_off00000c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94 14196 bytes
SHA-256: 251a4afd0a670b42fcd0fb68992fcb5ca2e7169ed3ee194605715311485682e3

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