Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5631416b99c62dc…

MALICIOUS

PDF

80.7 KB Created: 2021-04-04 17:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 558b0e3860ad5c50bbdedbd28567d964 SHA-1: 66f8843935863fc966f07bd6dae178b33ad9f96c SHA-256: d5631416b99c62dc42f2c766de1ef56d86899dda78644dda5768cda7c40e72a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'seumenha.ru' that is flagged as unknown. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spamming operation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. No scripts were extracted, but the presence of external links strongly suggests the document's purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/award?keyword=familia+enterobacteriaceae+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460461/normal_602d764b0c164.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/xajusiwumarawokuseriwowe.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/c_technical_aptitude_questions_answers.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/problem_statement_in_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_601ba836d6455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_6050359c4ccc1.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/71621133132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_604e7a4f7d6ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370547/normal_6006c69096dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_5fdc406fdda3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_605fa3fd5a2aa.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/walilufukivesixiniwe.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/how_to_do_taylor_series_expansion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_603b3881a6b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_60337e38bedcc.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/b3b5d809-864f-4c9f-b4b5-bc0f70645f8d/the_great_depression_and_new_deal_unit_test_answers_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b99575a-f308-4242-8661-d3035326cb66/vewuxewevabufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3c0978-6127-40c1-a382-0c6e4351f726/lutunajozufirarotudola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5cb3633-e0fb-423e-b1b3-4d18a7e557e9/big_fish_casino_app_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165d5d15-2b54-4d45-953b-dd0513dc7a2c/22733184775.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/warafuwifamoluwow.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/philips_universal_remote_setup_code_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d55f978-29a3-4450-9172-a332a2205fa3/jonivezipezawovoruzola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d943e1-f13c-4e97-9141-ac472e57e3ce/4361414226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b5c2e6-4c28-4159-b4e9-8debd6b9ab46/67444298926.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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5216 bytes
SHA-256: 6ed7824a387f26bc04ca15120469f85e3440e365f60c8de14c48f38185509d46
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 11972 bytes
SHA-256: 042037b75cbfb606f3b9f00f9e35e1a79d1dae90b2e0e731098b26e57bae5363