Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f0d182395cffbf…

MALICIOUS

PDF

360.8 KB Created: 2015-11-14 15:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bb3a2574064e8bb2b532f77e3a928f80 SHA-1: 648cc6d09bde2ad3f8162bb60fb357c9489468fc SHA-256: 83f0d182395cffbf8213913eca1abd5ff4e62c5d4cbb1746017f36743429886e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL that points to a suspicious domain, identified by the PDF_URI heuristic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of the malicious URL suggests an attempt to redirect the user to a potentially harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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%A4%D0%BE%D1%82%D0%BE+%D1%81%D0%B5%D0%BC%D0%B5%D0%B9%D0%BD%D1%8B%D0%B9+%D0%BD%D1%83%D0%B4%D0%B8%D0%B7%D0%BC+%D0%B8+%D0%BD%D0%B0%D1%82%D1%83%D1%80%D0%B8%D0%B7%D0%BC&charset=utf-8 PDF link annotation
    • http://media.nn.ru/data/ufiles/2015-11/f8/76/f1/564605f1a570c_mafiia1skachattorrentbesplatnonarusskomiazykebezregistratsii.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/97/5c/76/5646614390842_dpfotoskachatbesplatno.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/71/87/d0/5645a317cd866_windows7homepremium64bitskachattorrent.pdfIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000559cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559CD 7312 bytes
SHA-256: c653d1c0e2489ddf45f5e230085f9667f740ae4681bc9403c7c535f85994151f
font_01_sfnt_off00056f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F91 17304 bytes
SHA-256: 6f747d48095c011678c2605285914da4f638060ba990a5a15e6f7be5d1eba084

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