Malicious PDF — malware analysis report

Static analysis result for SHA-256 85090ebfb8805d99…

MALICIOUS

PDF

80.0 KB Created: 2021-04-01 19:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae64cad2b16235389fa2313f95821ee3 SHA-1: b3346ea25d98f6328e4bde8438369b2ca83971bc SHA-256: 85090ebfb8805d990176cbde98b4acef22134bd3b86b9b94ae0b26c62ccbf810
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ponafet.ru/wix?keyword=sample+apology+letter+to+family+member PDF link annotation
    • https://cdn.sqhk.co/xugumewaz/ihogegj/logifatavan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fe738169380b.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/aHieRgi/action_hero_biju_comedy_actors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_60420b3a63114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_602d1e5519b93.pdfIn PDF document text
    • https://cdn.sqhk.co/mebozesilo/ifKiaRU/mountain_bike_helmets_full_face_cheap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_60064c788edae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411944/normal_603fe60dc3a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_60255b32c6561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494669/normal_5fdc24fa6bec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_601d5b8a5358a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_60357f7095571.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/fidgcjj/define_virus_in_botany.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca62cda-2791-41b5-93ee-4af3fb45227b/how_many_calories_in_a_nacho_bell_grande_at_taco_bell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2455d7-80a2-40fa-8482-7ed30ae0d0ee/dresden_files_books_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171763ce-2cbf-4dd7-897f-5557ebe89f84/sawazuvekavawatupuvepi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/94864903567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1811ed32-582b-4264-9e6d-cc387f36a40b/what_is_the_best_stock_chart_app.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_f30386491bdb4d0d8dd5ef0adaaec389.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/31554186382.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/information_about_gst_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/11250830013.pdfIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_a2ce2dcabfab49d3ac8c6460daffad71.pdf?index=trueIn PDF document text
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_cd4471d9955843d79105af3365afaada.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_e3386ee9928e4da0a22005c723c84f76.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_05d15300d2194c40b44399c6280170e7.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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 5388 bytes
SHA-256: 922180f9fad3fe6f6a6d218a28e4378b8e0c0bf5ae24d6041363225fee5820b0
font_01_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 11796 bytes
SHA-256: e4f8f56583068947ac9d1ba9c69da977cc2dcb5292dde988e15dc9275728432b