Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cf93877ae30ca4…

MALICIOUS

PDF

348.6 KB Created: 2015-11-15 17:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 993eda08aad38c6134bf58864093b90f SHA-1: a62561c76498d8d887f32a183dc1a39017ee3387 SHA-256: 83cf93877ae30ca481ef63a716c7d93f606741b97d5eb7608be4b0bf3bebc6a2
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly flagged this PDF as malicious. An external URI was detected pointing to 'taurus-tg.ru', which is likely a malicious domain used for phishing or malware distribution. No scripts were extracted, but the presence of the malicious URL suggests an attempt to redirect the user to a harmful site.

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%A1%D0%B0%D0%BC%D0%B8%D0%B7%D0%B4%D0%B0%D1%82+%D1%81%D0%B5%D1%80%D0%B3%D0%B5%D0%B5%D0%B2+%D1%81%D1%82%D0%B0%D0%BD%D0%B8%D1%81%D0%BB%D0%B0%D0%B2+%D0%BC%D0%B5%D1%87+%D0%B4%D0%B5%D0%B4%D0%BE%D0%B2+2+%D1%87%D0%B8%D1%82%D0%B0%D1%82%D1%8C&charset=utf-8 PDF link annotation
    • http://media.nn.ru/data/ufiles/2015-11/e3/f5/08/5648882c4e54f_mefodiibuslaevladiasvetaskachatepub.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/8b/1b/5e/56485687712fd_akademiiamagirovkiratigrisskachat.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/73/6b/93/564875f086082_rabochaiaprogrammapoobzh5klasssmirnovkhrennikovfgos.pdfIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00052e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52E3D 7264 bytes
SHA-256: ed3525e60c398c5a92b6e0fd66bc10c8a36c04706335edcba3d0e1332d4bfb42
font_01_sfnt_off00054447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54447 14920 bytes
SHA-256: ee3775bbafbdd038c99fd75918aef2f7214b265fa8d54a0cfa504a4329b701bc

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