Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b9655d5b084b74…

MALICIOUS

PDF

84.2 KB Created: 2021-01-25 13:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: bcacd7e6433b2c7492abb26e566950a4 SHA-1: 43273cb5ce040b6e3bb0e431d182f005bf305e43 SHA-256: 98b9655d5b084b744159ebd51d44d41e84a8b655b52a53dc4afe053be411a108
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafffe.ru/123?utm_term=algorithms+illuminated+pdf+github PDF link annotation
    • https://cdn.sqhk.co/dedogupazib/e6928ji/18898450361.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/ijijOwL/rilogisixijifom.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/rOYdhh8/map_master_for_minecraft_pe_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/eyw1Dge/piano_keys_labeled_52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fc5bd066c742.pdfIn PDF document text
    • http://tonerinkstore.com/16169239903guh2r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5fd2700c61cab.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/gdKPAjf/board_games_lite.pdfIn PDF document text
    • http://greatholl.com/unicorn_color_by_number_pagesfrkrr.pdfIn PDF document text
    • https://cdn.sqhk.co/livefodam/jihcjeM/fajugib.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/ucZhhgf/11744053654.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/b8jbehe/langrisser_mobile_review.pdfIn PDF document text
    • http://bogplaktnc.fun/steady_state_vector_calculator_with_stepse63hw.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/ifZighe/pugilawurapusimufeka.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/x4YCggD/john_snowball_cpa.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/42xgggj/voltage_drop_calculations.pdfIn PDF document text
    • http://subfamjtii.site/gatizesik43y8m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5fd64fe37ce27.pdfIn PDF document text
    • https://cdn.sqhk.co/wexapitode/5idmjjR/96731011511.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/bLhgTVg/super_brawl_universe_mod_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotiworoz.epizy.com/english_worksheets_for_5th_graders.pdfIn PDF document text
    • http://zorarizasodefa.epizy.com/r_b_soul_music_mix.pdfIn PDF document text
    • http://pibusobi.epizy.com/38697118618.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_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 5584 bytes
SHA-256: 7f3d6b0fc69d6a65f5ec376934d2f39cfc33db9057947f5faf90eb28082f49b1
font_01_sfnt_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 11580 bytes
SHA-256: 72cb8580ccba6fbaed3471a4544f7f5fe796beb36700bc9a0fb793d073451837

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