Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf0337dceedeb22…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 15:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e409acf90c0daa4d6598082ab5115760 SHA-1: 3f1bdc331b36294695cdcc78130f5c62f30025df SHA-256: fbf0337dceedeb22b20372cd446229c5b24daebfe537e59900b77c1ffd35387b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one specifically pointing to 'bologen.ru/strik', suggesting a phishing or malware distribution lure. The PDF structure and embedded links are indicative of a link farm used to obscure the final malicious destination, a common tactic for phishing campaigns.

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=transit+anna+seghers+pdf+deutsch PDF link annotation
    • http://xadukododefisev.22web.org/i_pilot_remote_pairing.pdfIn PDF document text
    • http://vsedlyatebya.xyz/89988043073d5nhg.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/219190160619ynpc.pdfIn PDF document text
    • http://beautysss.site/65361192863g4zn6.pdfIn PDF document text
    • http://topijakalez.22web.org/nijejimidulidet.pdfIn PDF document text
    • http://segway-wheelchair.ru/treasures_3rd_grade_spelling_practice_bookjq7b7.pdfIn PDF document text
    • http://beach-fruit.fun/37569471350gtf6p.pdfIn PDF document text
    • http://proflist-kursk.ru/72626122345hua7b.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/neverending_story_dragon_name_pronunciation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidamos.epizy.com/eve_starter_guide_2019.pdfIn PDF document text
    • http://desetezovadu.epizy.com/24296902956.pdfIn PDF document text
    • http://suboxasolu.rf.gd/apoorva_kannada_full_movie_free.pdfIn PDF document text
    • http://zowisoburime.rf.gd/92397732315.pdfIn PDF document text
    • http://felixoxajaxev.epizy.com/6315406299.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/laxujojivawobezuxe.pdfIn PDF document text
    • http://nujunawefati.epizy.com/ruvivizujajasu.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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5332 bytes
SHA-256: 4d78f04898280bb50b587302b7a6a489e740d30466aaf5dec16e6e08c00321b8
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 10612 bytes
SHA-256: 00924fa61a0ac5442ab85ab33bf3d5f0776364fabdba6945845e1eefb87ac9a5

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