Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a034f091ed40e3b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 04:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: da6f081940401a7e3fc51c7713b91578 SHA-1: 96003c0d97233a3633f3056c7adb03f57249f309 SHA-256: 6a034f091ed40e3beed8e369d6307c230931378cc6470f9ae8fa8b04fc002bd2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a search result or resource, directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=flashback+a+brief+history+of+film+pdf PDF link annotation
    • https://cdn.sqhk.co/nadokikado/cihhgjb/gagazagerorelomenar.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/2707635.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/6655608.pdfIn PDF document text
    • https://betutemibo.weebly.com/uploads/1/3/1/4/131453998/08ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/QRi9Hgg/82663005130.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/f60d8874f0b07.pdfIn PDF document text
    • https://pojigivawoju.weebly.com/uploads/1/3/5/3/135348152/gizaxexono.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/hJjbhdD/malegoxobusisugelalote.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/tovigevunepawe.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/mitarumep-fuwotonozinafo-lasufaf-rimotozobe.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/XCjjIwi/nafunufijekogofogolexil.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/Bhe9grX/sweet_home_stories_playhouse_unlocked_mod_apk.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/3576404.pdfIn PDF document text
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/kugafemujefupil.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/gcPhjiQ/live_nation_tickets_legit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0ded3e-13ee-4ba1-8b01-20f6a329633c/how_to_get_filthy_rich_in_rising_asia_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a621374-5294-4083-b4e2-34ea72d2e29b/wordpress_themes_for_book_authors_free.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_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 5656 bytes
SHA-256: aa012bc6f979e3763aa700fb5c7c802ce92e3887cba3fa6b344b0588e284894d
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 10464 bytes
SHA-256: dd714ff70ea8ebe1afe259cb1ca6a1be18d1e04550215b24f927fa3106abfd9d

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