Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7295ef61c73cc3…

MALICIOUS

PDF

92.7 KB Created: 2021-02-27 08:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 52e6c0fb6753b91f8ba59de805fe9734 SHA-1: 09c8c772a3cbcfa1aaca10afe33d7d8cc3194e20 SHA-256: ef7295ef61c73cc321dd01a720bb03c06cf934d806959956808a15ea827e3204
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, and multiple external URIs were extracted, including one pointing to 'vilenefex.ru'. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection suggest the document's purpose is to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/award?keyword=2020+ford+mustang+gt+premium+0-60 PDF link annotation
    • http://activa-fb.com/78133661416dui5j.pdfIn PDF document text
    • http://dompodklyuch.com/game_textures_freee4355.pdfIn PDF document text
    • http://nubolats.xyz/chopsticks_2019_movievhur4.pdfIn PDF document text
    • http://it50off.info/natafewamonulazowareyeecf.pdfIn PDF document text
    • http://questotzvezd.space/bsc_1st_year_maths_question_paper_pdfluo4.pdfIn PDF document text
    • http://myfirstsite.xyz/500456448914wgsx.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/6Uhihhj/87743380460.pdfIn PDF document text
    • http://aycotoro5.xyz/44886703299939od.pdfIn PDF document text
    • http://chuvashovfamily.ru/clash_of_clans_gems_coins_and_elixir_generator12qvq.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/kagjgKv/femisaziwikidepizawi.pdfIn PDF document text
    • http://rfs.team/bejugewegirurqedpm.pdfIn PDF document text
    • http://letufemew.22web.org/88608090807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golanuzozabidow.epizy.com/what_is_the_moral_of_each_fable.pdfIn PDF document text
    • http://vikajedixased.rf.gd/how_to_check_amc_8_scores_2020.pdfIn PDF document text
    • http://zubeleboju.epizy.com/47625571178.pdfIn PDF document text
    • http://junorijuzijipu.rf.gd/diet_weekly_meal_planner_template.pdfIn PDF document text
    • http://wokupepafi.rf.gd/58425052224.pdfIn PDF document text
    • http://wokesoz.epizy.com/brays_school_tile_cross_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/sample_ballot_template_word.pdfIn PDF document text
    • http://faderutapuviki.epizy.com/lowrance_elite-5_touch_fishfinder.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 5692 bytes
SHA-256: 8748778779f6cb18ec14de67d129494c77caaf7e39edbd5dd5b5a56bf4ed7e06
font_01_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 10264 bytes
SHA-256: eebc8e0eaf4f608b3cf5d86929c38cae39461ed084d097aa83933d3a33a0594f
font_02_sfnt_off00014f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F72 17908 bytes
SHA-256: 9e0401da4e3b51f42cc1414eff823ffbdc99151a043b0ef0ce4d1e8c463e6edd

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