Malicious PDF — malware analysis report

Static analysis result for SHA-256 4294423d4850e1f3…

MALICIOUS

PDF

85.7 KB Created: 2021-06-01 07:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 301be8b1a368e12b25e8bb43906c8fc2 SHA-1: 5a2e757a1ffea0a9ac17bd812f42065f06d2ca17 SHA-256: 4294423d4850e1f34bc366462903909125964fd160b500555884cbe602935707
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure for media downloads, which is a common tactic for phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/pbw?utm_term=download+anime+shokugeki+no+souma+season+2+sub+indo+batch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475859/normal_605b7c13147ba.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/8953979.pdfIn PDF document text
    • https://fazebepipetuko.weebly.com/uploads/1/3/1/3/131384618/367a27.pdfIn PDF document text
    • https://wiwotejezewol.weebly.com/uploads/1/3/4/6/134691264/ad8363.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/6506179.pdfIn PDF document text
    • https://kijilijesudopob.weebly.com/uploads/1/3/0/7/130739968/9f7b9ba951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_606a172e4da05.pdfIn PDF document text
    • https://vetaroxavobu.weebly.com/uploads/1/3/4/4/134441067/nuvobasulujalin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fdc3c0f0dcf7.pdfIn PDF document text
    • https://wixewolo.weebly.com/uploads/1/3/4/5/134577565/jixobiza.pdfIn PDF document text
    • https://sagolofuba.weebly.com/uploads/1/3/4/8/134873879/jusuwefapuxit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144436719/tezorunesawijex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da105c0-eab1-44eb-aa59-9418ecd9babe/valixu.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427224/what_is_academy_sports_return_policy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0498d3a8-5934-4435-bc2f-2bdc7c670720/how_often_to_ventilate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4727e62-0f2c-401e-8c06-70bb5cf550a3/14377730618.pdfIn PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144446253/28741261516.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144424743/que_paso_ayer_4_pelcula_completa_en_espaol_latino_youtube.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/kiniwelavevaxomit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06fd515-7534-4df6-a49c-c15c4ee88f90/89311079563.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144413418/32030770031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0dad91-487d-4225-926f-3ac18cc9e478/east_of_eden_book_vs_movie.pdfIn PDF document text
    • http://noxixap.pbworks.com/f/90649003688.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/when_to_use_colons_semicolons_and_dashes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 5684 bytes
SHA-256: 5fdfa6e5f806f9f792712c287e2b9b35c2f77a6825a92e857e330459a1a23d26
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 11308 bytes
SHA-256: 5067ae95f138b0c0fef2884baec893511d1622b3fd5c19aa95fcb71b5213f302