Malicious PDF — malware analysis report

Static analysis result for SHA-256 087a4dbf8af14bf2…

MALICIOUS

PDF

83.2 KB Created: 2021-03-04 03:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 223ab1496b2630ec94a14c0cd12958e3 SHA-1: cb465ad272906fc887e2de09438393d538d6dc14 SHA-256: 087a4dbf8af14bf260ba9413c4df1ae313af5a3bc65bff8f6f0b77d19fb9cff4
186 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 a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://zajinet.ru/award?keyword=2005+mercury+25+hp+2+stroke+carburetor', is directly referenced in the document's metadata and heuristics, further supporting the attack pattern. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://zajinet.ru/award?keyword=2005+mercury+25+hp+2+stroke+carburetor PDF link annotation
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/448f1570b.pdfIn PDF document text
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/pefulag.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/2931424.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/duvarafobax_wujeto_riwuduzof_wudeke.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/98df0bff336.pdfIn PDF document text
    • https://loruwudo.weebly.com/uploads/1/3/4/7/134738316/9297450.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/badshah_movie_songs_free.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/nutonodixiwof.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/pikavonu_ropaduli_wusolabe.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/naduj.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/wanulujelavax.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/35948282493.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
    • https://s3.amazonaws.com/diwitapezu/read_application_x-_www-_form-_urlencoded_c.pdfIn PDF document text
    • http://jamoxuzas.epizy.com/piwurededenilawileso.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/stanley_300_amp_jump_start_system_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/manual_autocad_2018_espaol_gratis.pdfIn PDF document text
    • http://roxonotagake.rf.gd/bundeslnder_karte.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/cheap_monday_men_s_jeans_size_guide.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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 5476 bytes
SHA-256: c8ef0f4c61dbeb26089f28b6705fc06effb861f8b18d6c4237434440959fc727
font_01_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 13068 bytes
SHA-256: 39cdc3746605e752baab7434e5925acf94226d626ae5f200d70b1b6bc1260143
font_02_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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