Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3c8da8e13d6917…

MALICIOUS

PDF

76.8 KB Created: 2021-04-10 08:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed68714c9ed21338478a188d81dd2a8e SHA-1: 1c8dd3d68b7f9e0cc8c97dda8568cff11795f0b0 SHA-256: 2d3c8da8e13d69179c4bbc31aae8eca1c3b8f7dc168c6452a6fe74a59581c0ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to disguise malicious links. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jacksth.ru/strik?utm_term=when+i+was+seven+lyrics
    • http://consumer-data-protection-bureau.com/britax_roundabout_55_car_seatfw1bg.pdf
    • http://sputnews.com/arsene_lupin_contra_herlock_sholmesf982g.pdf
    • http://pudirexuzil.iblogger.org/chipotle_pronunciation_guide.pdf
    • https://cdn.sqhk.co/rawewosit/jcDibQe/nbc_sports_live_stream_premier_league.pdf
    • http://orehi-siberian-force.online/how_much_money_does_binging_with_babish_makeaakc7.pdf
    • https://cdn.sqhk.co/fuxuduxexi/kqe7GQu/attendance_management_gratis.pdf
    • http://bigchance.pw/its_kind_of_a_funny_story_ned_vizzini_epub_vkcubc1.pdf
    • http://vejofewi.iblogger.org/nopetifuxuvakafef.pdf
    • http://kulinar2020.site/xowolidanolama2nib7.pdf
    • https://cdn.sqhk.co/wokowuvawuz/ih2hbi1/pesuki.pdf
    • http://pubgucbayim.com/wurosepednhw8.pdf
    • http://ca-manalapan.space/pokemon_go_kanto_pokedex_151ru4q8.pdf
    • http://creditreportfast.info/what_do_you_do_if_you_forgot_your_ipod_touch_password4l4a3.pdf
    • http://goromeo.club/ozeri_kitchen_scale_out2mqeaw.pdf
    • https://cdn.sqhk.co/vebiziwob/jfrrhfv/short_almond_acrylic_nails_white.pdf
    • http://zuvels.xyz/maus_1_summary040z2.pdf
    • http://organize.shop/32336054979a6gt.pdf
    • https://cdn.sqhk.co/sunomedude/shAEhiC/kizefesaxolidapibijuxubij.pdf
    • http://pravagims.net/duzamozegudiwesimu7hem0.pdf
    • http://specialsale.info/zaxowemevomesazedalufovj3lg.pdf
    • http://bluebadgeform.com/4576975759ov1bg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugirike.epizy.com/48039114230.pdf
    • http://jizokiw.rf.gd/nokuxak.pdf
    • http://sogigadataga.epizy.com/48115647612.pdf
    • http://mugukogegib.epizy.com/polisa.pdf
    • http://mupetebufobam.epizy.com/wuvotetiromobitadonu.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_off0000ee42.bin
634b0dcc138ee74d2084935eaa2545b5a10dd09b667672668f93d1ed0d638f75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 5152 bytes
font_01_sfnt_off0000ffe5.bin
333f0e27203d08cc1a89e0f9b82991968e3e111834f3c9c69f408df5eb81270f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 11144 bytes

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