Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bab5c4f3cb7490…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 07:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 265b1cf24f8d784a62d7f276471fc0e5 SHA-1: 84f0fe8b7498c136b15b7bc4fb8bc8eb1d62530d SHA-256: a9bab5c4f3cb7490570addce0125ee7928c7e3a41080fe5b089100a2d331fa3a
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings point towards an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/wix?keyword=deadpool+kills+the+marvel+universe+again+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477638/normal_602c4f903aea0.pdfIn PDF document text
    • http://wosatonosefenaw.iblogger.org/vadibibesetewuripevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ffb47f30008f.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/2abde13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_6035c6f9c6be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_6029c87997875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_605f7582adeaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_603045390163c.pdfIn PDF document text
    • https://susotavawo.weebly.com/uploads/1/3/5/3/135325365/5709437.pdfIn PDF document text
    • http://vajamerafimal.iblogger.org/bigajup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_604a052e1df1f.pdfIn PDF document text
    • https://zebakikalelu.weebly.com/uploads/1/3/0/7/130775248/jogexugowudo-bugemexubit-wijakir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5fe9003ef13e5.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/3411427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_6046542670906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/11d0d90c-f2a7-4eb4-a7b1-83cb85d1cedb/momofil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8a865c-9ec0-4dbf-818d-73359a9ceb3b/manual_for_keurig_2.0_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1abbcf6-2633-4a2b-9ebb-e0685f764c97/tikunobiminigepivojeziba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf349816-8948-493e-ae70-ef5741d09726/patijuxugipiwabog.pdfIn PDF document text
    • http://davupuvaf.rf.gd/ocean_lakes_map.pdfIn PDF document text
    • http://ruvowepager.epizy.com/19882595044.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 5552 bytes
SHA-256: 6cc6158d1d8750bd97d84df620a23fc3d470728660b0128fafb327bb0c68f8e1
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10696 bytes
SHA-256: 6b4f8f56b40921c24e0229dd0f6417784716393454e43238c0f12270a7c8a0f6
font_02_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3