Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e28339dfd6e30a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 13:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: dd342012dd3b433303b6372591815ddf SHA-1: 1bbba305c39453973a0e2c51ed41974d117d411f SHA-256: 26e28339dfd6e30a21f470ff695512723e99c474f8c9e6d955ea0df3074aafbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous URLs, some hosted on disposable domains. The embedded URLs and the PDF structure suggest a phishing or malware distribution attempt.

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://jacksth.ru/strik?utm_term=the+one+book+summary+john+marrs PDF link annotation
    • http://vanusix.22web.org/42420731184.pdfIn PDF document text
    • http://tefozunamosolo.iblogger.org/honda_manual_transmission_fluid_walmart.pdfIn PDF document text
    • http://finutepanaj.iblogger.org/master_clean_antivirus_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420910/normal_604af0b09268a.pdfIn PDF document text
    • http://wibimozuj.22web.org/information_security_controls_template.pdfIn PDF document text
    • http://community-day.ru/24001028993c29ho.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/IJjjxie/btv_national_tv_guide.pdfIn PDF document text
    • http://grusha.space/how_do_i_sync_my_vizio_sound_bar_to_my_vizio_tvek2oy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_6036045be6ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_6049782810acb.pdfIn PDF document text
    • http://leree6.club/nuvovosuwevinetaro231s0.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/jgfZ8aQ/44624332876.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/ghjdqjb/major_lines_of_latitude_and_longitude_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikevanalujik.rf.gd/cad_furniture_blocks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ca36b5-3f99-496f-a951-ff01083df398/the_intelligent_asset_allocator_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44db68f-d8f3-4c09-a265-9a1a0d188415/wahl_km_cordless_pet_clippers.pdfIn PDF document text
    • http://bifezuragumizi.rf.gd/70443675869.pdfIn PDF document text
    • http://peguretunemidom.rf.gd/gosegamugufagupajos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d34a2b-f6e2-48f9-9bbe-3f4848934aec/pibuvizov.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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 5224 bytes
SHA-256: c03dae16139151c2a2a785a4178420e0829a83c021be4477cf601fd260837a4d
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 10912 bytes
SHA-256: 50322e6c9edcb8be989c84e4d85d0dbe34e443e32c398fbc155ad9f824655c08

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