Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791d9b782fe08c9…

MALICIOUS

PDF

74.1 KB Created: 2021-03-23 03:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ef0a465350c6afadcef3be42f7efe3e SHA-1: 216706f2715f388a269f12b5e5281beffc0f3cee SHA-256: b791d9b782fe08c93874730fff8e86e6b523a1f5c44dbb6f38ed66667e240a92
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'https://pelibifir.ru/strik?utm_term=troy+bilt+tb240+engine+oil+type', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm hosted on disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=troy+bilt+tb240+engine+oil+type PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424951/normal_60011d27ccbfd.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/mozofirazajonapi.pdfIn PDF document text
    • http://bhd-management.space/21472666788574d7.pdfIn PDF document text
    • http://kindraretterath.com/savoxufotukixigifin0ca62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_60349e999fbb6.pdfIn PDF document text
    • http://naturagrush.space/86256733658p473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ff06ccb54779.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/lixazukitamaxomo.pdfIn PDF document text
    • http://mazafaka69pussy.online/xababisiv2lys.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/xomine.pdfIn PDF document text
    • http://7lessons.site/courier_companies_tracking_number_formats1pym0.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/9684560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_6039de38c10e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/gevalia_white_thermal_coffee_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/22636225352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98870caa-a627-4722-ae12-c97b2fa554ac/31542989757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca16fcf-6553-490b-af0f-26fd9a9697f2/wakam.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 5152 bytes
SHA-256: 9c98f760b4ac6770146b6359b055ea57ceec10fe7dd5fe16e6a6dae13e26e49e
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10728 bytes
SHA-256: f5bbd3ee96f133676f312727892871381ca6a26508160352cd3b0707de93348c

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