Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e331ebea51e694…

MALICIOUS

PDF

75.1 KB Created: 2021-03-02 14:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 44c746f48b78d332e751f6099b578f8d SHA-1: 1befdbbbf093daa76398dfbdb4c1852a3bc4f67e SHA-256: 72e331ebea51e69458e250c4020f6edd23436799a61c28dab6a2b6c5351dc209
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference educational content to mask its true purpose. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document is designed to redirect users to malicious 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://mezovuduw.ru/wix?keyword=bozeman+gibbs+free+energy+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/rifusofuwedi/Apjgjge/kpop_ranking_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/hgh5ji6/calcium_carrageenan_vegan.pdfIn PDF document text
    • http://reduslim-ordina.site/battery_tender_waterproof_800_istruzioni41g9c.pdfIn PDF document text
    • http://winsl.space/93229638910rnatc.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/wepevuzems69us.pdfIn PDF document text
    • http://agentsecure.space/the_grinch_book_2018a7rfm.pdfIn PDF document text
    • http://lavka-karamel.ru/taxiwaluxelobosapexoof15l.pdfIn PDF document text
    • http://hocostyle.ru/dumopedovirotudilumayhli0.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/Jztiaif/clash_of_clans_th12_attack_strategy_2020.pdfIn PDF document text
    • http://9gusevshop.space/47194580820hgr1t.pdfIn PDF document text
    • http://websporizlehd.com/spectrum_reading_grade_4_a_morning_in_mainevllv4.pdfIn PDF document text
    • http://goodik.fun/lesinedanolegudegyemjq.pdfIn PDF document text
    • http://sallehub.xyz/866989826524d0e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jglSySO/5771475165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://genenapukiral.epizy.com/minecraft_skyblock_randomizer_map.pdfIn PDF document text
    • http://siserize.rf.gd/wabosubare.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/80816565842.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/sumir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 5436 bytes
SHA-256: 6c881718deae88a466fbc9f4f4cda79106364e7903c3631f5af02be26ce37131
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10348 bytes
SHA-256: b7840abd84c3cdc35b44a77f4eae113d69012aa5e78941c31fe6b88c7f6c23dd
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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