Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f3d786d6bf0968…

MALICIOUS

PDF

69.0 KB Created: 2020-11-19 18:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7fac31b2cedddacd772842ceee5d576 SHA-1: 772dcaa5c80c432ada5c4f194e3910c7ae2b5e0f SHA-256: 52f3d786d6bf096881644bef8b708640713a9e10acd65897a7ef7b3ddf2cef4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with one pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of numerous links are indicative of a link farm or SEO spam tactic designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://trafffi.ru/strik?utm_term=comment+%25C3%25A9crire+droit+sur+une+feuille+blanche
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fa2a5207e3c9.pdf
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f9414969a301.pdf
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/rifunuror_vobamagazikox_fepomexubureval.pdf
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5fa598ae5c813.pdf
    • https://kezodedekupamo.weebly.com/uploads/1/3/4/6/134605888/831fea0933594b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rufonali/elemental_workshop_osrs_3.pdf
    • https://s3.amazonaws.com/xisefowu/free_pc_fortnite_accounts_with_a_lot_of_skins.pdf
    • https://s3.amazonaws.com/tadovu/22646533411.pdf
    • https://uploads.strikinglycdn.com/files/dd1b2a55-eb33-4bad-aa3e-e26f9026c5a7/jigenow.pdf
    • https://s3.amazonaws.com/kavitokolezub/bengali_news_paper_free_download.pdf
    • https://s3.amazonaws.com/vuraradaso/31260778504.pdf
    • https://uploads.strikinglycdn.com/files/ffcd1811-d400-42f2-911e-fd801410defd/susafediruradixitod.pdf
    • https://s3.amazonaws.com/fajeloninesitel/ganetatanagivutasasiwi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c398.bin
62a035592abc06f7f1bf807df54ea8470bcc7a9f9e0b2f2618f168e676808bb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 5448 bytes
font_01_sfnt_off0000d59e.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 1800 bytes
font_02_sfnt_off0000de2c.bin
f4888e1be37e33a2f20dd7faa809ada5d54c58574c77f3229135ce6d16bc4b41
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 11984 bytes