Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9ad266cf36e56b…

MALICIOUS

PDF

36.7 KB Created: 2021-05-26 10:27:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4605764ac7b77d300f7a50483348cdf8 SHA-1: f4e338d6f0691edee0f72b4935a856529c9bb57c SHA-256: bc9ad266cf36e56be124e4ec65950fb394565179e748b4535f5b6f341ebb2822
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic to disguise malicious links behind a seemingly harmless visual. The embedded URL, https://emuske.page.link/Yrfx, is a URL shortener, which is frequently used to obscure the final destination of a phishing or malware delivery attempt. The heuristic firings strongly indicate this is a phishing lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0774

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 36 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://emuske.page.link/Yrfx In PDF document text
    • http://www.microsoft.com/typography/ctfontshttp://fontfabrik.comMicrosoftIn PDF document text
    • http://www.microsoft.com/typography/fonts/default.aspxIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 5944 bytes
SHA-256: 913670cdbcc6cdbc76ff192f501fd574decef5d61277de5cd555285d2261509e

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