Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b4b3b0fb0a9872…

MALICIOUS

PDF

19.0 KB Created: 2021-05-28 10:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a8e3a238b4e0290ad95a33c38d1383ce SHA-1: 285a06a35bd0ed5a2c498845a54787b5ecd3d604 SHA-256: 81b4b3b0fb0a98724188572bd80b2808c16ee0f1b63b296b778225be2ed418cf
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, typical of phishing campaigns. It contains a single embedded URL that leads to a URL shortener, which is a common tactic to obscure the final destination. The heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

Heuristics 3

  • Image-only PDF lure links through URL shortener high PDF_IMAGE_LURE_SHORTENER_LINK
    PDF is image-heavy with little real text and its clickable action points to a URL shortener. This is a high-confidence credential-phishing carrier shape: the visible page is a screenshot-like prompt while the destination is hidden behind redirect infrastructure.
  • 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.
  • 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 https://prizon.page.link/LbNr In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3ACE 4716 bytes
SHA-256: 4db3cc7582b49e72e74bdf3e120ab8e047165b80541ba22efe1bdeb451c76f39

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