Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6241b2f7c54bfb4…

MALICIOUS

PDF

69.7 KB Created: 2021-05-12 00:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 32039ffc87ecac2318f18151c7753ce7 SHA-1: 218cee2e3f20838a06523f786f3ea1cb711f0234 SHA-256: f6241b2f7c54bfb44877ed1137508cd606d8247ec8d202c933b42573b3e5d120
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with at least one, 'https://vilenefex.ru/strik?utm_term=lost+heir+wings+of+fire+book+cover', appearing to be part of a link farm designed to redirect users. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

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://vilenefex.ru/strik?utm_term=lost+heir+wings+of+fire+book+cover PDF link annotation
    • http://vemelaribox.getenjoyment.net/5741956591.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/khalid_ibn_al_waleed_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_60149578d0f2b.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/dosamosumirubamazipunugex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fce7abd10509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fd3b717b1b8d.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/abrasion_resistance_of_concrete.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/65ea3a68-93a4-47d8-941e-c7077a7281f9/sub_zero_18_wine_fridge_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b13abef-3100-4cb4-9db1-67ef23066154/g4tw_sims_4_eco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82ee069-ccec-40c9-b06e-4ff3aa8fd8d8/hunter_dps_classic_wow_bis.pdfIn PDF document text
    • http://fodixox.rf.gd/vusesatobalixezovavep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8363a96b-0402-4c01-9101-777e2193c563/jizobof.pdfIn PDF document text
    • http://dekidad.epizy.com/william_shakespeare_poems.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/administration_and_supervision_in_education.pdfIn PDF document text
    • http://xejarejunap.rf.gd/22687955013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b16f2f8-a1c8-4c72-8434-ea8f2add956a/9025494880.pdfIn PDF document text
    • http://bilurosekina.rf.gd/all_english_antonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc19c30-b27f-4710-8032-c07cab15c04d/63304355059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4240693-227f-43ea-9840-e6a960eb319f/kitchenaid_stand_mixer_ksm90_attachments.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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 5200 bytes
SHA-256: d0dbb6dfe2d0ee4fbe4c1aae81490955b39b445fbb4711c3e22647bc164c4035
font_01_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 10524 bytes
SHA-256: 56a3eeb9c59cf7750ec59252c636b025df94a0e003359e4e96c2aa7999f9d045

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