Malicious PDF — malware analysis report

Static analysis result for SHA-256 934e1d04973ae282…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 18:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9769169d52528210ec4164b41986b6f SHA-1: 2ef5dbeab58221421dcccccb700d48b72a56abf1 SHA-256: 934e1d04973ae2821ee530d9272aa5e780cc70eb56bf148b93be63cf9796bdcd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users.

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://seumenha.ru/award?keyword=active+and+passive+verbs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486200/normal_605b80751f264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_5ff951df5d74c.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/the_professor_and_the_madman_storyline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463791/normal_6048156c409c8.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/6RCq1FB/america_s_funniest_home_videos_episode_1.pdfIn PDF document text
    • https://nagobajega.weebly.com/uploads/1/3/1/3/131380413/nerifutuvorobo-zinejimozadok-kipokijede.pdfIn PDF document text
    • https://domisupufiz.weebly.com/uploads/1/3/5/3/135316273/panabar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_604db8aa39d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_601ddad8f1f9d.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jfUr9c8/lojosuna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_60001bd324821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416506/normal_5fee9068ab3ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5ffa26c0d5993.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/0WhggcW/cinemark_ecuador_cartelera.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/kelukakeb/assembler_directives.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/circuit_switching_in_computer_networks.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/ming_chhichhore_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/71340967397.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 5304 bytes
SHA-256: 6b0c8642f3e8374ce4b5e1563783a98ca026d462726c7cb1c98efb3b917f8100
font_01_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 11324 bytes
SHA-256: 43294d2bc6e4de25a52d0016a92104f6f2b72e295165164d8dc37b37791f6a14

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