Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22743560924d276…

MALICIOUS

PDF

75.3 KB Created: 2021-03-11 20:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 83ad2456310e471e912b3b7d5cf8a20b SHA-1: f6c5dd8c092c5ffe95f487017ed390d6924dce45 SHA-256: f22743560924d27667dd8b427bc8c1cae1d107c3758f626c3ca0ba9f8648ec5b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious destinations. The document body, though heavily obfuscated, contains text related to 'world of darkness character sheet excel' and 'wkhtmltopdf', likely serving as lures to trick users into clicking the embedded malicious links.

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://baarspo.ru/strik?utm_term=world+of+darkness+character+sheet+excel PDF link annotation
    • https://cdn.sqhk.co/reruzemafow/CXGnjg8/romancing_saga_2_wiki.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/unidad_3_leccion_1_reteaching_and_practice_answer_key_avancemos_1.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/jg0mtJq/xekagoxemoreteduwokuwevas.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/h6hiDjd/stickman_project_videos.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/xineguxovaranuvataji.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/9Ejhw9F/dijelo.pdfIn PDF document text
    • http://bodopeme.iblogger.org/68275387782.pdfIn PDF document text
    • http://limezage.scienceontheweb.net/pdf_to_word_converter_program_free.pdfIn PDF document text
    • http://lavijowonuxogu.22web.org/basobutolesofasono.pdfIn PDF document text
    • http://fuxarirudutosas.iblogger.org/initial_elpac_score_report.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/a_cup_of_tea_katherine_mansfield_questions.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/37896130481.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/39770535010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_af43fbfabb2849c397be4be6943c30cc.pdf?index=trueIn PDF document text
    • http://tobikinos.onlinewebshop.net/vowedilusaga.pdfIn PDF document text
    • http://litorow.myartsonline.com/filivurisa.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_46b2cb4f49604aec8f03e4e62360a7d3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 5256 bytes
SHA-256: 6fa95088c387cf5181cee1ecad69b244f487c0862a3335c4d8efec2fde1b8c6c
font_01_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 11144 bytes
SHA-256: 8791ce95d7252b714eb3d6eb790f32e122c1827938f115fb4608a40521b5fa3a

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