Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bdae446732a298…

MALICIOUS

PDF

74.7 KB Created: 2021-01-04 19:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 855ba715b8731b1e1118d7fbf1d68e8a SHA-1: d3dc96962f02e8d8135e136de23f5b99092f055a SHA-256: 35bdae446732a2984b85b57286d8e96125bbaab43819fe8bb111fac7dbd52124
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The embedded URL `https://trafficel.ru/123?utm_term=pictures+of+instroments` is likely part of this lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=pictures+of+instroments
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fa7eccf7b2b3.pdf
    • https://cdn-cms.f-static.net/uploads/4451228/normal_5fb4bb261e789.pdf
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fefcdb41794c.pdf
    • https://cdn.sqhk.co/zifiguwosu/ugc7egj/39777452531.pdf
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/7960761.pdf
    • https://cdn.sqhk.co/xolafunodo/Agdgj3G/roundup_rate_per_litre.pdf
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fe6f14f0272c.pdf
    • https://cdn.sqhk.co/zetikitor/bgeoifM/gopusonelakogi.pdf
    • https://cdn.sqhk.co/wirowanorax/j8jicfA/90634994312.pdf
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/6013c.pdf
    • https://cdn.sqhk.co/muvetowiripa/jbG09jg/snapchat_support_lost_snap_streak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b27c5d9-e61d-423a-9c26-ee6ce4785bda/gakofew.pdf
    • https://uploads.strikinglycdn.com/files/9d1c9dec-4184-4499-a6ee-d76d235ba42f/49001551462.pdf
    • https://uploads.strikinglycdn.com/files/4e03c4a3-6fff-4b7e-9557-a447a6f96424/jivomijijopiniwusi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e825.bin
5ffe952235454969a7b2560ddb27c08a87125730cc2c5c4c9f12553bf312bd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 4784 bytes
font_01_sfnt_off0000f85c.bin
d260fc2475e15967abc70b3220833e3884fb19ff7782fd80c0b284b3ad5ee2fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 11144 bytes