Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb1e76a55b91330…

MALICIOUS

PDF

158.6 KB Created: 2021-03-24 17:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fe97516b2558af30f12e18aa2ab4d3e6 SHA-1: 7f84fcb1368574fcc0738cb3bca86da6a64e0ac5 SHA-256: 6cb1e76a55b913300499365a06b022752b39e41aac87d8d6c50c24e07e0e7c4a
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The embedded URLs and the PDF structure indicate a link farm designed to redirect users to potentially malicious websites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 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://druttle.ru/award?keyword=diccionario+griego+espa%25C3%25B1ol+biblico+pdf PDF link annotation
    • http://nudistoff.club/30328055559gqc1t.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/gagurudatirikejawuxxvbw.pdfIn PDF document text
    • http://nebo-baikala.ru/infectious_disease_guidelines_malaysia0m5v1.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/ijshbic/box_with_x_instead_of_emoji_android_meaning.pdfIn PDF document text
    • https://tivirubopif.weebly.com/uploads/1/3/1/4/131406506/8358828.pdfIn PDF document text
    • http://heliusdesign.ru/epic_games_installer_apkoceo9.pdfIn PDF document text
    • http://meriline.store/makawiwxhnp4.pdfIn PDF document text
    • http://goproonly.com/breville_bov800xl_accessoriesj3cmx.pdfIn PDF document text
    • http://maslovauto.ru/ks2_year_3_maths_worksheetszpcq6.pdfIn PDF document text
    • http://bestplacefor.rest/17797093817a9lx4.pdfIn PDF document text
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/dakez.pdfIn PDF document text
    • https://xisulufi.weebly.com/uploads/1/3/4/8/134870666/vipomif-minumugujeb-banamiji.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/8jaijji/50742334924.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/hRjbOic/general_hood_battle_of_gettysburg.pdfIn PDF document text
    • http://koreanluxe.com/5th_grade_common_core_math_standards_unpackeddvhy3.pdfIn PDF document text
    • http://naturebiolog.fun/ps4_gold_headset_mic_not_working_wiredx5dwv.pdfIn PDF document text
    • https://cdn.sqhk.co/vavegewumur/i3BavFG/32002222404.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/2iboC00/good_captions_for_picture_with_friends.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikadunutifowew.rf.gd/autocad_presentation_download.pdfIn PDF document text
    • http://vubenotabajumem.epizy.com/tizen.pdfIn PDF document text
    • http://nexolep.rf.gd/what_are_the_objectives_of_auditors_in_auditing_data_management.pdfIn PDF document text
    • http://pugijomo.epizy.com/aster_aweke_songs.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000221a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221A1 5672 bytes
SHA-256: 147c04f1d896c8a51031d996a100c713f3a804b13a1912a66a9dcfd06d97db69
font_01_sfnt_off000234ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234BA 20152 bytes
SHA-256: 8d493aabb9402e5d38ff95f93660ad75d70798c54f79d9a27fe9f1c87dec1f26

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