Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b3d7ae9c37c135…

MALICIOUS

PDF

99.7 KB Created: 2021-03-02 14:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2735144e782bdd6223d7a28fc05f27b SHA-1: fc989b7925d87eda319e4ed6dd42da8b6d17588a SHA-256: 41b3d7ae9c37c135f4c271ceaf1b09f26e528cfb7e8ee7d77826deb223955391
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to car parts, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/wix?keyword=2004+mini+cooper+buttons+guide PDF link annotation
    • https://cdn.sqhk.co/bufudoraxala/4gc7Ygc/58525776754.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/satuma.pdfIn PDF document text
    • http://bluetea.space/47847835089b80v8.pdfIn PDF document text
    • http://vvd.bar/bhojpuri_movie_nagina_freegm977.pdfIn PDF document text
    • https://cdn.sqhk.co/volumusigu/1ni38je/39780937322.pdfIn PDF document text
    • http://coins24h.com/tedodifidgppo.pdfIn PDF document text
    • https://cdn.sqhk.co/kabawamurelo/WQicxKW/jasobotol.pdfIn PDF document text
    • https://beziremisolexew.weebly.com/uploads/1/3/4/6/134656792/e7932ffaa73.pdfIn PDF document text
    • https://nugasoxitobaj.weebly.com/uploads/1/3/2/7/132710773/ziwimakukepe.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/gJhdjaO/kabononulume.pdfIn PDF document text
    • http://emirofficialzm.com/glass_sword_cinema_showtimesvnn0g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimarol.myartsonline.com/sigareme.pdfIn PDF document text
    • http://wafugid.epizy.com/musician_artist_bio_template.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 5560 bytes
SHA-256: 770394ab97a7d851fb1ee93efc5aed7d1f4307237dfe6caecda103f243627c3b
font_01_sfnt_off00015df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF8 10480 bytes
SHA-256: 71cc41a2fb643613cb200992289e854aa84298d82135e5c91a8790001f7da3d9

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