Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9230705c6b8ef1d…

MALICIOUS

PDF

89.7 KB Created: 2021-06-13 01:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b881e208673f4d4287d192cf9342fa21 SHA-1: 0d2f649f6fc7e48ebac0e2d794eee2567833e634 SHA-256: a9230705c6b8ef1d89b21ca29a3e7b18a124bfca2a34a7b35ab2c4ce37a2bb50
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/pbw?utm_term=resident+evil+the+final+chapter+william+levy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6021510ff0582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_6055cd488b3c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371814/normal_5fdeaea26c0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_6040026c18bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_604771cdbce6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_60c03e8705596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_60494d19ca8cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekitejug.pbworks.com/w/file/fetch/144641517/can_iphone_4_be_unlocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd049050-a1b5-4251-97f7-83e9dbe9cbba/brother_hl-2280dw_scan_unable_af.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189edf17-ee36-4865-b3cb-3f8133a3fa0c/tuvebowakilosasufodavu.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/10_std_maths_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceabf1ed-ff04-42d3-8eee-cec5ab7bf327/21460195629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83142d13-8ff4-401d-8b44-ec64f66a8c80/77380425701.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/how_to_calculate_cronbach_alpha_for_likert_scale.pdfIn PDF document text
    • http://bitejite.pbworks.com/f/48666993613.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144446826/mipevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74f8178-226c-486b-89c5-9aacb808f022/mikedotipapana.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/sezebiwanafusedifowusi.pdfIn PDF document text
    • http://jowenoxo.pbworks.com/f/ver_pelicula_diario_de_un_seductor_espaol_latino.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/w/file/fetch/145092135/kubopo.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144499245/53013230479.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/f/vixesazovizakowijunuva.pdfIn PDF document text
    • http://tulezibat.pbworks.com/w/file/fetch/144858666/54309232789.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_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 5656 bytes
SHA-256: 3d74312ad6a125a4a22a89d5a46d651df3d9bf18c01c16c603562af3f05bdb49
font_01_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 12104 bytes
SHA-256: 6ac39943379ee71de88f11023bb278442ba52ef39f27d66520d4edf9eccbbffc

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