Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d71ff5358b36b2a…

MALICIOUS

PDF

88.3 KB Created: 2021-05-17 06:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2a2b1bd1b1f77726a363f0d70393d96c SHA-1: a63b927bea98a6f8aff16b0a6e47857fd605455e SHA-256: 2d71ff5358b36b2ae60441e7ef0abe41d4eaf84e1f48165051bc5cf956a37f98
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, many hosted on disposable domains, designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to historical clothing, likely to mask the malicious intent of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=what+did+a+peasant+wear+in+the+middle+ages PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/hWjf0gh/lethal_weapon_4.pdfIn PDF document text
    • http://webcam-model.online/kitchenaid_electric_stove_top_knobscf6dx.pdfIn PDF document text
    • http://marketitaly.info/xadefederitumosaparazm9ipt.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/398643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_601b519b5466b.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/hcihgg4/riverside_drive_thru_movie_theater.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/TwhbjjF/87922704304.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/Y3eUihg/18289092775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6042c8eb7f65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_602af431ced9e.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/1e83f359504fe4.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/ghLgdhf/best_sound_effects_library_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/iK2ngdm/super_slow_motion_apple.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_605bf5352db05.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/chaQhgp/rufigovezeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_600a077cabe01.pdfIn PDF document text
    • http://easterthjg.com/duvepofupototimaauwgm.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/hdDrUij/sup_gamebox_plus_400__1.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/hcRgjGN/mevajakopesufalolobev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_3df0ae63877b48048cc86f425ccf8602.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_2913f34c585a4046acfb7d59cd595945.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_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 5480 bytes
SHA-256: cdf81bf9a15758f8a110384d2e6c337eb06f3cf2ea185b9699f163e3d09ae501
font_01_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 10712 bytes
SHA-256: 4e16de958785afdc5fc436963d92ef41baeb0d6db604285f3139d44d1dffe4fa

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