Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81dd16af90d390b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-18 12:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 95e49065df647956e0a75ef8c6d4c87e SHA-1: 72737041d3f0c49cc6bf675312a01418e19d151f SHA-256: f81dd16af90d390b69f5d0a8923e2c0ea38f22db1e1c6ab0ca69739c8712e069
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=castrol+gtx+diesel+15w40+pdf PDF link annotation
    • https://cdn.sqhk.co/fokigegoma/dibjbha/drum_machine_app_for_iphone_4.pdfIn PDF document text
    • http://romotogez.22web.org/video_converter_for_android_2._3._5.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/9397246.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/fhhHger/50960108606.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ifmjjhc/lefolikugef.pdfIn PDF document text
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/lowupogu.pdfIn PDF document text
    • https://cdn.sqhk.co/vuramufef/iijjgge/19699181288.pdfIn PDF document text
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/pofogarerukigik.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/tovufa.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/XohaUhg/tip_calculator_split_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/d4if3ja/police_chase_los_angeles_airport.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/pewiwiv.pdfIn PDF document text
    • http://texulateniz.iblogger.org/deburepexasavamejug.pdfIn PDF document text
    • https://cdn.sqhk.co/zivupowixede/egjJ5yY/cute_vsco_backgrounds_for_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/fhdTjay/kujuzaradezuxuwifepe.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/8088989.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lidojogepe_deronivoli_xevudixunop_pevebiduj.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/fij32g9/miralax_instructions_pediatrics.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/41776e1fca85c.pdfIn PDF document text
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/69c288c2d7.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_a77b9b9a277e4417aeba24200b30a1ac.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_f4596380e2424c06a3bfe9966c46138d.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_336e968229a04460a6922072e1776c4d.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_db958808778341208faaceed816ee9a2.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_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 5680 bytes
SHA-256: e575127969f499b7f672844e42b30fb90e254f176cb6214bf86c5abbb0cffc48
font_01_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 10656 bytes
SHA-256: b36f2fc166675be4fe9bc0cce6f1f126a7177f4a2078bc3266201a8d8c13ac86