Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa2198928a0c904…

MALICIOUS

PDF

79.6 KB Created: 2021-04-24 11:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3e3161f55f86718bd5b0a93fb28eb6 SHA-1: 6da311dfc00963f9f9ec088dec3e541ea51844a2 SHA-256: 0fa2198928a0c9043bfaae34c6ec3cc7184e132e4d2287d2ad4c59a078244356
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files hosted on link farms. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to printer toner and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=brother+hl-l2360dw+toner+replacement
    • https://vedoguru.weebly.com/uploads/1/3/1/3/131380953/dipiliwuzopiwifet.pdf
    • https://cdn.sqhk.co/dezuvosowato/bGKijZh/stick_super_fight_hero_battle_hack.pdf
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/sumobosovetis_xotaruboda_jitizalos.pdf
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/60226eac5.pdf
    • https://cdn.sqhk.co/molodomo/dbJsvWg/princess_dress_up_and_makeover_games_videos.pdf
    • https://cdn.sqhk.co/jututumogu/eidKieY/horror_skins_for_mcpe.pdf
    • https://cdn.sqhk.co/tamurikubol/ji9WAsR/vimenidufefurokuzatemilo.pdf
    • https://wadasowodasi.weebly.com/uploads/1/3/5/3/135316150/c8d0e70337708.pdf
    • https://cdn.sqhk.co/tisojubew/dL8Njgj/battle_angel_alita_ova_download.pdf
    • http://rowowevu.mypressonline.com/zuwaketiji.pdf
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/ranawavumi-tajirezi-wuriv.pdf
    • https://cdn.sqhk.co/rolidofajug/jjifIjc/93597687596.pdf
    • https://viremekim.weebly.com/uploads/1/3/1/4/131407965/woxesa_suwoz_gabovixiniba_gikarofu.pdf
    • https://cdn.sqhk.co/viwiratoposu/bvtPPgj/parallel_high_quality_voice_chat.pdf
    • https://cdn.sqhk.co/xexisini/if7tjax/vomonozisebus.pdf
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/2a21fa6.pdf
    • https://cdn.sqhk.co/busibelifiv/jcije3j/best_jump_scares_in_horror_movies.pdf
    • https://cdn.sqhk.co/wutijiwatar/degf6A3/xuranipodubabekuletij.pdf
    • https://rexajubimazon.weebly.com/uploads/1/3/4/8/134884463/4a8579c60dc91.pdf
    • http://jorowijedo.mywebcommunity.org/english_speaking_practice_sentences.pdf
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/pevidobula.pdf
    • https://cdn.sqhk.co/nawamuzimosu/QhhggTc/vijinizananug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gozenabuzixi.onlinewebshop.net/rosie_revere_engineer_summary.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_off0000e7d6.bin
7d6dd30775dcd16676364dcaea4d93a6dfd94b64161b443816ec3acee8be6008		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 5900 bytes
font_01_sfnt_off0000fbd7.bin
dc162f08fbf3999a4f1dc9170c336d4b7c2d710e05609b2a279b8ba783a94e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 21988 bytes

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