Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5b4b761f4c7a44…

MALICIOUS

PDF

351.5 KB Created: 2015-11-08 11:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 1cce9edb306e13bd9fc4d0fdba3a9970 SHA-1: 9ec0f7bbff57de9660bda7ac4e009f8802e94f1f SHA-256: 4d5b4b761f4c7a44399e10e289dc1d7d2a626b49bdad45a92ba99de9d1abafb9
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by an ML classifier as malicious. It contains an embedded URI pointing to 'taurus-tg.ru', which is likely a phishing or malware distribution site. The document body is heavily obfuscated and appears to be non-standard content, further suggesting malicious intent. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://taurus-tg.ru/?nnr&keyword=%D0%9E%D0%B1%D1%8A%D1%8F%D1%81%D0%BD%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+%D0%BE%D0%B1+%D1%83%D1%82%D0%B5%D1%80%D0%B5+%D0%B4%D0%BE%D0%BA%D1%83%D0%BC%D0%B5%D0%BD%D1%82%D0%B0+%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%B5%D1%86&charset=utf-8 PDF link annotation
    • http://media.nn.ru/data/ufiles/2015-11/11/7f/36/563eb41a19eab_instruktsiiapookhranetrudadliamekhanikagarazha.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/68/97/6a/563db682e9d5d_tekhnicheskietekstynanemetskomiazykesperevodom.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/aa/7c/60/563dcca2934f3_obrazetszaiavleniiaopodtverzhdeniitrudovogostazha.pdfIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5382D 8560 bytes
SHA-256: 02eede85b53a857ae7379f3979024126d8cf1b9a3d1961e4fd3c190f9dc9afce
font_01_sfnt_off0005520c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5520C 13920 bytes
SHA-256: d3e32a8b27015b3df662e9a46fdc9f91bcc1a6a84ffbdf83ba0cf2f0c0e33537

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