Malicious PDF — malware analysis report

Static analysis result for SHA-256 a963d1399916c692…

MALICIOUS

PDF

372.4 KB Created: 2015-11-10 11:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a06a721967b21b264d57e0a37e47d1be SHA-1: 38238b3136529d2850906654e9bbe2c30e34c833 SHA-256: a963d1399916c692f30e97274287b393f3ed406e6a9e588667a2dfe8685ffbbc
74 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier with high confidence as malicious. It contains an embedded URI pointing to 'taurus-tg.ru', which is likely malicious. While no scripts were extracted, the presence of the suspicious URL suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and does not provide clear textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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=%D1%88%D0%B5%D1%80%D0%B8%D0%BB+%D1%81%D1%8D%D0%BD%D0%B4%D0%B1%D0%B5%D1%80%D0%B3+%D0%BD%D0%B5+%D0%B1%D0%BE%D0%B9%D1%81%D1%8F+%D0%B4%D0%B5%D0%B9%D1%81%D1%82%D0%B2%D0%BE%D0%B2%D0%B0%D1%82%D1%8C+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE&charset=utf-8 PDF link annotation
    • http://taurus-tg.ru/?nnr&keyword=%D1%88%D0%B5%D1%80%D0%B8%D0%BB+%D1%81%D1%8D%D0%BD%D0%B4%D0%B1%D0%B5%D1%80%D0%B3+%D0%BD%D0%B5+%D0%B1%D0%BE%D0%B9%D1%81%D1%8F+%D0%B4%D0%B5%D0%B9%D1%81%D1%82%D0%B2%D0%BE%D0%B2%D0%B0%D1%82%D1%8C+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0PDF link annotation
    • http://media.nn.ru/data/ufiles/2015-11/07/fb/41/56417d478c0bb_torrentfilmydliaandroid.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/95/8d/b4/564168fb8ed79_razdachaakkauntovmainkraftlitsenziia.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/9a/37/75/564190d19c24b_dstu3781-98skachatbesplatno.pdfIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00058b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B4E 7732 bytes
SHA-256: 9fab4b34a0d9e893628a8d6570b5b1780c40399d4ae843043684c25bb076f3ec
font_01_sfnt_off0005a24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A24A 14928 bytes
SHA-256: eeeb0df4c5167cf766b413c815b531b0a27243f955928acc991e01a3ae32a43e

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