Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff1c1ebbbcd3106f…

MALICIOUS

PDF

76.6 KB Created: 2021-04-13 10:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9fa2c2e605503c1f348b795e729d55ad SHA-1: 2cf46accfd4dd005a1d8109e9358b9f7afd34a0d SHA-256: ff1c1ebbbcd3106f53562d2ebca1891beaeea74af05c7f33d200d181ef92bd98
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=how+old+should+u+be+to+read+the+selection PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5feb173cd9903.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/a1eaaeeaa3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/Gighjci/7742581179.pdfIn PDF document text
    • https://cdn.sqhk.co/xelibini/5N3Pv7i/magic_tiles_game_online_free.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/46001ec09652f5b.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/3196251.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/bohemian_rhapsody_piano_accompaniment.pdfIn PDF document text
    • http://begedotupatato.66ghz.com/gate_verbal_and_numerical_ability.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/jojori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_6042d75e18537.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/9946264.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/9f7c1983-18a4-4631-b57d-c76df6ffe369/tork_pool_timer_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab445a6-c611-48b0-8e4c-f0db9502caf5/race_in_america_matthew_desmond_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd619ec6-034d-4941-8810-2e75ea719172/pexisazaxivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f2eb38-23b7-4c6a-a625-b06c52c1d1d0/63101203744.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_71fc626359b54031846906f7eba58dfb.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_32077801b82441fda1c819e58b1b0c7c.pdf?index=trueIn 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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 5220 bytes
SHA-256: ec5c0404ccdee9c652390ea6f52a942f1828fed103ff67a2dfb0d0de42f4b122
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 10836 bytes
SHA-256: 2a1cbe33c6a45bc8b7ae0188154712b416d68119e96a48d248a7417c429f7af8

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