Malicious PDF — malware analysis report

Static analysis result for SHA-256 6709c611aff9a672…

MALICIOUS

PDF

87.5 KB Created: 2021-04-08 19:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7a6a873c6fa112b299c27b65a1973da SHA-1: a84a02fe552a51f754871a244e2cca2730f25f8d SHA-256: 6709c611aff9a672d0670340e5531cf3ae29dc5a27e2b2449b2c233d83fe2c45
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, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to potentially harmful content.

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://maypoin.ru/strik?utm_term=g+shock+5081+ga-100+review PDF link annotation
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/6406233.pdfIn PDF document text
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/kesepubopazu_pagafesubogolud_lutanix.pdfIn PDF document text
    • http://lidudopunabiril.22web.org/aromaticity_lecture_notes.pdfIn PDF document text
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/2365579.pdfIn PDF document text
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/pojinigigiver.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/771b600ef30.pdfIn PDF document text
    • http://xopiredat.22web.org/mossberg_930_3_gun_accessories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogamesesokuj.rf.gd/33632619130.pdfIn PDF document text
    • http://luremugaxufarup.epizy.com/jiradejel.pdfIn PDF document text
    • http://nojisibi.rf.gd/positive_psychology_interventions_definition.pdfIn PDF document text
    • http://wakunama.rf.gd/19650038997.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_67b320a4de48452781a920c95566523b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/war_of_the_worlds_2005_tripod_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0619d209-8752-468b-86b6-fb02bd5f9521/74097724409.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_3ef68da07108403887155a7c6d1aeb0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf5aacd-1460-4254-a59c-18bbea67920f/wesoxudada.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_77fea084c1fe443e9b5bffc376ae086a.pdf?index=trueIn PDF document text
    • http://sisumufavezawa.rf.gd/ielts_general_reading_and_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/xowokupadilo.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_f3aaf359abe3478d82d18385e86f259b.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_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 5820 bytes
SHA-256: 3f166d6bd1211eaaf49e2b32bc7cbab659b85e3d7e908f809476abc5a326609f
font_01_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 11304 bytes
SHA-256: 3a03de2d28624747e408e38b40a79bdd58d675d48ca91e92874b1dde7ac3f87f

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