Malicious PDF — malware analysis report

Static analysis result for SHA-256 da97fb2a3c101d02…

MALICIOUS

PDF

353.7 KB Created: 2015-11-08 19:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: aafa668c6102cb87671c853561b8384b SHA-1: a23024410a98b091abe38a97895ccff0772747f6 SHA-256: da97fb2a3c101d02be33082847faa978874e9a2088baa93efb398968458c4073
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious. It contains an embedded URI pointing to 'taurus-tg.ru', which is likely a phishing or malware distribution site. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

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%9A%D0%BB%D0%B8%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D1%85%D0%B8%D1%80%D1%83%D1%80%D0%B3%D0%B8%D1%8F+%D0%BD%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5+%D1%80%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE+%D1%82%D0%BE%D0%BC+3&charset=utf-8 PDF link annotation
    • http://taurus-tg.ru/?nnr&keyword=%D0%9A%D0%BB%D0%B8%D0%BD%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D1%85%D0%B8%D1%80%D1%83%D1%80%D0%B3%D0%B8%D1%8F+%D0%BD%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D0%BE%D0%B5+%D1%80%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE+%D1%82%D0%BPDF link annotation
    • http://media.nn.ru/data/ufiles/2015-11/aa/94/70/563d8d6b0d756_koddliadomofonaforvard.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/e5/e5/5f/563d942c885a6_kliuchaktivatsiiguitarpro6.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/34/2d/b6/563d7e34ec5cc_skachatgkrfsizmeneniiamina2015god.pdfIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000539c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x539C4 8864 bytes
SHA-256: 9efacc23e00d49bbf7ae0e3f7017e8ee83980eac95083e47d5447ae0810da385
font_01_sfnt_off000553a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553A0 16772 bytes
SHA-256: 65c83369ee30aa1e0a18dd60a523e2ad15f6e4bc49e5e17acb412c376248ce6f

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