Malicious PDF — malware analysis report

Static analysis result for SHA-256 53179b6620297b7a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 21:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 14e2b4fdaf1e12b6273a38919988b724 SHA-1: 767444d95594d10ceb1cbea061d1abba8b3e6c17 SHA-256: 53179b6620297b7a8060e4596068cccb6c33e74e1c7da689fa6589cfa1052a77
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to potentially malicious content.

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/strik?utm_term=how+much+does+a+janome+6700p+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375195/normal_603b151c8cb78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_6038b72637f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_5fd2784642337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fc61e15639c6.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/vilaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5fcd28fca5c8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5fc8face017e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6059a11f8471c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_bf4ab4a8f5474fceb3c63e91a52b0450.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_5a57e23697fc4806bd49fdc619a3bf87.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_fc4eea314a20410f9f3261275721a66a.pdf?index=trueIn PDF document text
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_06a38877073b458f946d9e47c60680cf.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_ba7b4125ac334e4b9256c62e31db1243.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_36d993ed4e274ef58eed5858412f52cb.pdf?index=trueIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/how_to_reset_a_hunter_sprinkler_system.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_74f4094e5b8e4624a645df55f52ce46b.pdf?index=trueIn 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_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 5692 bytes
SHA-256: db5f5ae79fd6b238612c796bdef962612a643470f9df82f19175b64b6117ae94
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 11008 bytes
SHA-256: d71cb9f7c60bef3586f61d491a50c9d295acf71f2724ead4871f0026af5c335a

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