Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a71f1b1384639c6…

MALICIOUS

PDF

27.8 KB Created: 2021-05-28 10:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d3e7458a8daa988da62f8cabc28b1bfd SHA-1: 8a490911f22302e47e28e189a7df28e0ac292206 SHA-256: 3a71f1b1384639c65d11b5743d3f23a9d1e98326ccb42293e6f3d99e9fd9133e
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, typical for phishing attacks. It contains a shortened URL, msen.page.link/cTu5, which is likely used to redirect users to a malicious site. No scripts were extracted, but the heuristic strongly suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1153

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 27 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://msen.page.link/cTu5 In PDF document text
    • 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_off00005beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEB 12396 bytes
SHA-256: 9651c78dad64c31681e27aaf77368dfa0aab65a72df78104afb2fc8edab34c59

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