Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c88c55f947b674…

MALICIOUS

PDF

9.1 KB Created: 2021-08-14 17:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 003850844e75629503b40c9dcd2d142e SHA-1: 4bdc31f1b4b90695aa3891de56b9c67157b3c808 SHA-256: a3c88c55f947b674e887430cf49e6ca59250ca6ef2a7b590fe1d27960ee29095
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, typical of phishing attacks. It contains a deceptive link pointing to a typosquat domain, d1976ls.updta78-serv1ce.info, which is likely intended to host a malicious payload or phishing page. The file's structure and the presence of a deceptive URL strongly suggest its use as a spearphishing attachment.

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://d1976ls.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_off00001108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108 12396 bytes
SHA-256: 9651c78dad64c31681e27aaf77368dfa0aab65a72df78104afb2fc8edab34c59

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