Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee7a66aa72824f8…

MALICIOUS

PDF

80.5 KB Created: 2021-02-15 13:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 808bac946d02e01191183a9399534fe7 SHA-1: 6461987ca52884085f92e71fd9968a0bdc036d60 SHA-256: 7ee7a66aa72824f8d60d81749d4ffc77774c08abe6aa04758e7b58d5f99113b5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with one specifically pointing to 'bologen.ru/strik', suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=which+lavazza+coffee+pods+are+the+best PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452593/normal_5ff297fa770de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fe7718f7a929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_6015427d73598.pdfIn PDF document text
    • http://tricitysikhs.com/ninja_kiwi_btd4_expansionw2ut2.pdfIn PDF document text
    • http://requiredjokblog.com/linear_equations_word_problems_worksheet_grade_7gk8za.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_600dbf164185b.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/nuzabipabaverinizojedopatjm6m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ff6b17cbf9ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_6006607125184.pdfIn PDF document text
    • http://opticsystem.website/fuzelefajelafulerunok2de7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_6014416c3f74d.pdfIn PDF document text
    • http://it50life.pro/jenezapowivoboxu457e.pdfIn PDF document text
    • http://thepropheticapp.com/relax_tv_apk_downloaddp59j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kibiviridox.epizy.com/american_college_of_chest_physicians_antithrombotic_guidelines.pdfIn PDF document text
    • http://pubometev.rf.gd/80977614307.pdfIn PDF document text
    • http://sudemididesiz.epizy.com/kijatotefuk.pdfIn PDF document text
    • http://tapopopabe.rf.gd/ge_logiq_e10_probe_guide.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_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 5508 bytes
SHA-256: 08be86ae4590af7b1b0119a052d52b061cb83ea1a341786533e1d8ab27179c2b
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 12324 bytes
SHA-256: ee7ff83d50c2fa1e92768d841447fa26fa3613c586d57e3eab9620de9829d7f9

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