Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff2289874c4136b…

MALICIOUS

PDF

80.5 KB Created: 2021-03-08 09:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f6b2f0c36024b06b78e712c4445802 SHA-1: 643b8ca7a3a3b0315ea2eb5ec317d002f20b09b1 SHA-256: 8ff2289874c4136b6c8933a811141e7c43312753b7d4e38748acefd5866a06c2
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'jumiwimov.ru' which is presented in the document body as a tool to remove Windows watermarks. This suggests a social engineering tactic to trick the user into visiting a potentially malicious URL. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=windows+8.1+build+9600+watermark+remove
    • http://rejemezurufoveg.mywebcommunity.org/xutevoxage.pdf
    • http://xolokukifimiv.sportsontheweb.net/52479849006.pdf
    • http://miromawetibikew.mywebcommunity.org/noughts_and_crosses_book_analysis.pdf
    • http://goodnatural.space/gre_vocabulary_app_free_downloadnyiqp.pdf
    • http://blockingscenery.com/xizorojebiri71jy8.pdf
    • http://vowufijetapiko.sportsontheweb.net/how_to_fix_kenmore_elite_dishwasher_not_draining.pdf
    • http://basvuruizleme.online/cubic_boxing_3d_apk_downloaddfkci.pdf
    • http://trells.space/casio_amw320r_batteryqxadd.pdf
    • http://idealicaitalia-official.site/11140894440md3uh.pdf
    • http://zutatowatipo.mywebcommunity.org/pwm_solar_charge_controller_price_in_sri_lanka.pdf
    • http://tavafotuzefox.sportsontheweb.net/robert_bringhurst_elements_of_typographic_style.pdf
    • http://futajef.medianewsonline.com/the_history_of_computer_programming_languages.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ea2795e-e9a1-4cd4-955a-8106525cc47b/genie_model_2022_remote_programming.pdf
    • https://uploads.strikinglycdn.com/files/2dc09567-2814-4424-b132-225d54982f75/soundarya_lahari_sloka_95_in_sanskrit.pdf
    • https://uploads.strikinglycdn.com/files/f8b9f7ff-5c5a-410b-b54c-6c5e601f95b2/kevewaduvatep.pdf
    • https://uploads.strikinglycdn.com/files/bd778e74-d6ae-49d0-a449-7bf3194b9764/what_are_the_7_stages_of_human_development.pdf
    • https://s3.amazonaws.com/gifiz/fosiwegonoregem.pdf
    • http://xekabotiwuker.atwebpages.com/48553934887.pdf
    • http://nisetekotixob.myartsonline.com/6th_grade_math_performance_tasks.pdf
    • https://s3.amazonaws.com/bajuse/deck_the_halls_sheet_music_choir.pdf
    • https://uploads.strikinglycdn.com/files/ed16a72b-2aea-4984-bda5-5bf3f6b59972/lubefas.pdf
    • https://s3.amazonaws.com/kulinisokakewi/14719563011.pdf
    • https://s3.amazonaws.com/fixararololu/60294140448.pdf
    • https://s3.amazonaws.com/jifedefujodu/6584034329.pdf
    • 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_off0000fb18.bin
491fe649c98f9e68ed83b62bdc35352cba34df8c94dd7ca5d0eab6b381bcef2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 6072 bytes
font_01_sfnt_off00010fc8.bin
d430a5b9904c9d6e9e8c8349aeef19eefb261678656eb7a63ed84de79578fe38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 10740 bytes

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