Malicious PDF — malware analysis report

Static analysis result for SHA-256 617783813fa46198…

MALICIOUS

PDF

73.6 KB Created: 2021-05-04 13:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 59ea706ee911d6c44e830ff14f818397 SHA-1: 26ea8d91c857ccc91175ba4a933ecc16fa55fb12 SHA-256: 617783813fa46198bf3e618f19b619a10963af92bd5b435d8357789e0e5ba413
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the heuristic findings suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=que+es+ser+lider+educativo PDF link annotation
    • http://chatik85939775.fun/13961586478o8nz6.pdfIn PDF document text
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/nefujurenu.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/toajgjg/lodunanilejes.pdfIn PDF document text
    • http://pogadai.xyz/what_is_six_figures_a_yearo70qm.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/gjbhfOy/paypal_phone_number_402.pdfIn PDF document text
    • https://tigoxugijiwubaz.weebly.com/uploads/1/3/4/3/134315710/3712133.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/zinirekiben.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/24Rjjjf/castles_of_mad_king_ludwig.pdfIn PDF document text
    • https://mejapibidar.weebly.com/uploads/1/3/4/3/134315264/ec5ccf9fa.pdfIn PDF document text
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/robegew_bukus.pdfIn PDF document text
    • http://ulekschool.online/fifty_shades_of_grey_2019_full_movie_download_filmywap6ir9n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/the_white_tiger_book_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106fa0b7-d13e-4c22-837b-693d8b021414/life_fitness_95xi_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9f8ede-c3b6-4e27-82f5-970a788fce9a/zanatosoletalak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc93f14-a2af-4066-a9bb-95df3ade0172/arris_surfboard_sb6141_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40376aae-c594-4c69-be77-389413144167/does_jodi_arias_write_back.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_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 5052 bytes
SHA-256: bf0f3f25928255f747bf22d1eab588f3d208885699fc652e3097425ae9d781e2
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 11580 bytes
SHA-256: 7d11549b07e1854f8d4fa0c78e9a9e2d36549f8451a3b2bb1837e9c03830c92b

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