Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef6a1706ed3c2e4…

MALICIOUS

PDF

85.5 KB Created: 2021-05-17 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312d6e67fbed2da11b852f32c9fef418 SHA-1: 226629a1f532086bb0a419ffab766bed5e11cd85 SHA-256: 2ef6a1706ed3c2e4443d97caef7a2ef0c3351b792c844ed08f0216f8947200f1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF documents, likely intended to obscure the malicious intent and distribute further content. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=electrolux+central+vacuum+instruction+manual
    • https://cdn.sqhk.co/tinipuded/aghjhij/colors_of_the_wind_sheet_music_piano.pdf
    • https://cdn.sqhk.co/xorilulog/cN3leYq/line_of_defense_tactics_tactical_advantage.pdf
    • https://cdn.sqhk.co/lojumisebu/jc5PGgd/angry_birds_go_1._8._7.pdf
    • https://cdn.sqhk.co/pigajifaw/BifaD4m/cisco_webex_meetings_scheduler_for_office_365.pdf
    • https://gikemuzeta.weebly.com/uploads/1/3/4/4/134442652/ravetomax_tegiwuzaz.pdf
    • https://cdn.sqhk.co/reriwoduriju/jdmgiHF/rugby_league_championship_2019_results.pdf
    • https://cdn.sqhk.co/dajebala/ghCzRhb/badlanders_wind_lake_menu.pdf
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/daraxadoro_bipiriw_lasalunamovem.pdf
    • https://cdn.sqhk.co/vojazodelud/Meghiis/home_design_makeover_free_lives.pdf
    • https://cdn.sqhk.co/guvevifowo/g8hejht/butilivavovivuw.pdf
    • https://sibuzowad.weebly.com/uploads/1/3/2/8/132814892/2475621.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/7696005.pdf
    • https://cdn.sqhk.co/bubiwalifeda/Fijgggf/92056924160.pdf
    • https://cdn.sqhk.co/bapisolel/MZMjjii/93797316501.pdf
    • https://tepugajir.weebly.com/uploads/1/3/0/8/130874129/ladoninakajow.pdf
    • https://cdn.sqhk.co/muzolorakow/abUuhjk/xigapekexabituxiz.pdf
    • https://cdn.sqhk.co/koxajavu/8bgdgjV/64345365217.pdf
    • https://cdn.sqhk.co/tuxonewebuke/dhfjdie/world_cup_soccer_2014_game_unblocked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ce.bin
a2d4eb83a02998fb7e6b7e51babc437b08fb4fa9e001385dbfd0e8a082b48517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 4912 bytes
font_01_sfnt_off00011665.bin
c166b0bfd05065052201ce69089a923817e39d19a21398bc6b6911d507212fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 10664 bytes
font_02_sfnt_off00013a41.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 4324 bytes

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