Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8e2c79abbb1827…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 00:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed8a38b5033f0cf1457a965318c337bf SHA-1: ebffa5195e37306ff2b6999b0a9d319cc69fdaf7 SHA-256: 8b8e2c79abbb182722b8f15931b4f8187097d5f73b1b25b9cc83e3934835ff79
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains numerous external URIs, with one specifically pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The presence of multiple links and the 'link farm' heuristic indicate an attempt to obscure the true destination or distribute various payloads.

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/123?utm_term=descargar+airmore+para+android
    • https://cdn.sqhk.co/puxedimuwo/ifHif8v/arkham_horror_card_game_deck_runs_out.pdf
    • http://micrometer25bill.site/begiviluvukimiduborurote4vc.pdf
    • https://cdn.sqhk.co/sagitusat/jhagehb/dollar_tree_store_winnipeg.pdf
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/7b2a5fef2e9e24c.pdf
    • http://salestore.pro/73279536818gvoml.pdf
    • https://fepanaxowa.weebly.com/uploads/1/3/4/3/134311119/a5b146.pdf
    • https://cdn.sqhk.co/joxonorapa/7icieHy/78562021026.pdf
    • http://ingmijn.com/chargesheet_filed_in_498a21a90.pdf
    • https://cdn.sqhk.co/nuzifixe/iansheT/66431626346.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gasolawatovi.rf.gd/stockholm_airport_map.pdf
    • https://s3.amazonaws.com/guwutivupudutu/96854871337.pdf
    • https://s3.amazonaws.com/pezofut/how_to_reset_hisense_roku_tv_without_remote.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_ddd354e1a8bb478a8bf5b7d95886b307.pdf?index=true
    • http://danokob.epizy.com/3d_tuning_pro_mod_apk.pdf
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_9ce0964ae94f4ef1b4d0426266821e96.pdf?index=true
    • http://xejarejunap.rf.gd/facebook_page_image_size_guide.pdf
    • http://deravamosu.rf.gd/ed_rosenthals_zero_tolerance_herbal_pesticide_concentrate.pdf
    • https://s3.amazonaws.com/fusopoxipo/14714376784.pdf
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_6c8e28b018714430a68dddedef65d0eb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bf.bin
710d5e170ea41fc8c478387a537bbdc6ad78a5504aa78e120f992a5bc82e794c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 5360 bytes
font_01_sfnt_off0000f6ea.bin
ac29d433902b9f75310f2c23ef5c0df1e0df1b4cde8f7b2ff21735e664d76bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 11592 bytes

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