Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5892a9d7d6a097…

MALICIOUS

PDF

87.2 KB Created: 2021-04-30 18:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f9e0eaf4a33387ef62fc8d60e1cab97a SHA-1: 5394c51755763335e6b9fd91eff47e2446db7804 SHA-256: 1e5892a9d7d6a097f4e5d5df214b5b4a3d6b6ea4e6a949b3b52f6613a2eb1512
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=peripheral+route+of+persuasion+define PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450337/normal_6040267973e72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_60332f708a261.pdfIn PDF document text
    • http://nutisoda.22web.org/13696575588.pdfIn PDF document text
    • http://mujepojubum.22web.org/40529335441.pdfIn PDF document text
    • http://rijupoxog.22web.org/sasufoluliganam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_5fd76b4121da5.pdfIn PDF document text
    • http://gesofetol.iblogger.org/musuteranefukulof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_60430da20635b.pdfIn PDF document text
    • http://lisipezasuk.iblogger.org/rosadinexegazulevuwaxus.pdfIn PDF document text
    • http://xunajoza.22web.org/badinerie_violin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baperosuvo.rf.gd/guzepakuvijubigunixuwakom.pdfIn PDF document text
    • http://vujujejinegu.rf.gd/search_on_iphone_6.pdfIn PDF document text
    • http://bitibidebizofu.epizy.com/sizajudipajulitivufad.pdfIn PDF document text
    • http://gosovugan.epizy.com/funzoa_happy_birthday_song_video_pagalworld.pdfIn PDF document text
    • http://siwapog.epizy.com/best_home_electric_food_slicer.pdfIn PDF document text
    • http://jilagikudi.rf.gd/daily_attendance_record_template_free.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_40a974c7784c44f0b37e286ca2b5bece.pdf?index=trueIn PDF document text
    • http://bejawuxinekaz.epizy.com/what_should_i_make_first_in_my_air_fryer.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_334dc57ef5ab4c7586a0b7a92aacea50.pdf?index=trueIn PDF document text
    • http://wekijedi.epizy.com/nevup.pdfIn PDF document text
    • http://faripemisale.rf.gd/82048287672.pdfIn PDF document text
    • http://mogavor.epizy.com/aptitude_and_reasoning_questions_for_gate_exam.pdfIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_0f4483c0e3d4440e942a464d8485fde8.pdf?index=trueIn 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
    • 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_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 5132 bytes
SHA-256: dff664c5a7c48e644315571f833e5d86d008252e5c82c14248ec4d998fe15feb
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 11584 bytes
SHA-256: 049a84826f244097f2e9e23383f684cdc0a9709c40967c3fa76c41cf6e6100f2
font_02_sfnt_off00012c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C41 19748 bytes
SHA-256: 729986453dc6fd2d0ac9f5e82f3e67ac0c6339abddee0f95838d7dc25d813aa2

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