Malicious PDF — malware analysis report

Static analysis result for SHA-256 678cd845fa5a2f8d…

MALICIOUS

PDF

148.3 KB Created: 2021-03-24 18:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3288642827b5ad86ff695b2c06397284 SHA-1: 7b97693f18fd4daee706e1b52cf87d4b96be854f SHA-256: 678cd845fa5a2f8da8864b02e79f2d9e57d4fdc12033e8509f433837f235fdfc
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, with heuristics indicating the presence of external URIs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The primary malicious URL, https://jacksth.ru/award?keyword=boule+de+suif+guy+de+maupassant+pdf, is embedded within the document, strongly suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/award?keyword=boule+de+suif+guy+de+maupassant+pdf
    • http://vefavirona.22web.org/dupapuk.pdf
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/bogoposeluxomalulex.pdf
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/9464d7c1.pdf
    • https://cdn.sqhk.co/bexefoboxevi/chhXQ91/hero_xpulse_200t_mileage.pdf
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/8090768.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/nebize.pdf
    • https://cdn.sqhk.co/gujowaxexag/AChgfhf/rush_ball_dancers.pdf
    • http://lodemazupunogas.iblogger.org/61538326919.pdf
    • http://nopezimugabotik.mygamesonline.org/encyclopedia_dictionary_free_download.pdf
    • http://penexej.mywebcommunity.org/bositu.pdf
    • http://sewatumafuta.medianewsonline.com/how_to_write_a_5_paragraph_essay_for_6th_graders.pdf
    • https://cdn.sqhk.co/julukijowi/iJ3hcou/gb_whatsapp_v_7._20.pdf
    • https://cdn.sqhk.co/sunomedude/IoOSthc/lupatuxakaxotoxavobujopir.pdf
    • https://cdn.sqhk.co/telazaje/iZuUjc7/cover_photo_collage_maker_for_facebook_timeline.pdf
    • http://sevowina.medianewsonline.com/kamiduna.pdf
    • http://pagavopalubutu.scienceontheweb.net/amelie_soundtrack_sheet_music.pdf
    • https://cdn.sqhk.co/lodikorep/ggj7igG/zegikudilogekif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gozegatunefafet.epizy.com/kenmore_dishwasher_kick_plate_installation.pdf
    • http://tumobuwixakeg.atwebpages.com/how_to_check_undefined_symbols_in_.so_files.pdf
    • http://gumizaxewa.atwebpages.com/ielts_listening_answer_sheet._download.pdf
    • http://wesaloxovep.rf.gd/el_regreso_liberal.pdf
    • http://samajusinifako.atwebpages.com/vehicle_bill_of_sale_template_fillable_free.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_off00020ec3.bin
043f9e5c212043242b9ea56409e9528acb8dbfaef5ff00c8ebc2fa17e821d4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20EC3 5416 bytes
font_01_sfnt_off0002212f.bin
986753f0b24633bd83a64a469326dda38e135bb95474ccd1453409185cb77434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2212F 10092 bytes

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