Malicious PDF — malware analysis report

Static analysis result for SHA-256 94823b2414f85f48…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 23:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9c3b8adfc0b16413b000a6443ba452ed SHA-1: 0bce6031a5b47e0f3f895272d15af3d41cb3a8d2 SHA-256: 94823b2414f85f48c060310853ccb41748ccf01d02a9d5c6b1edbb1e7d6a58c3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it functions as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+to+say+i+listen+to+music+at+home+in+japanese PDF link annotation
    • http://duvejajenivogik.getenjoyment.net/40445077709.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/wUgdjf5/76059271007.pdfIn PDF document text
    • http://wigosixozem.mywebcommunity.org/bunojabu.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/iUhfBmK/60440586686.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/figevatuno.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/biwisowivogor.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/hzcXJ1S/59335640173.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/icifage/super_slime_sam_2020_poopsie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojirezanis.epizy.com/libro_del_rinoceronte_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/bitlife_app_not_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/rotona.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_5c2718d91c894417bc81c86408e22cd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/acknowledgement_of_paternity_form_ohio.pdfIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_a7a98b7ebeae44c390b8d57bdb2c3441.pdf?index=trueIn PDF document text
    • http://jasukapikubov.rf.gd/teparexukutemifedudo.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_bd4929eb00214a899f9014b4e5955358.pdf?index=trueIn PDF document text
    • http://figopovu.epizy.com/befufunawizejaguxexuta.pdfIn PDF document text
    • http://zowolowoziru.rf.gd/kadarifizofa.pdfIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_ac0f79bbd71c4cbe93ea8caf96092b40.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_0daa6fb1d1de42cab7a92d68317c8d55.pdf?index=trueIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/xakupulifax.pdfIn PDF document text
    • http://fawipiro.rf.gd/22813732388.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_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 5308 bytes
SHA-256: 78c22dce969b88cb27fad8bbb97b97166d637bf31412ad87c9886c1dd32a3ff5
font_01_sfnt_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 11144 bytes
SHA-256: ae3cd0f9ceda28acd4a490b62a5b659938edba91b91b3ab630a9305aef45163f

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