Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e98f6e48ba1517e…

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 08:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b77f4f5a4208d89aab6dd05b93e8a19 SHA-1: 0934f37d11e7885b6d67b8703a1632e6c993ee45 SHA-256: 6e98f6e48ba1517e65b727913d013c092473783f4e8acc3a7eeae6b041e4d9c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDFs hosted on disposable domains, indicating a link farm designed to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://mnwebdesign.dk/userfiles/file/63416406869.pdf
    • http://kietminhrivet.com/upload/files/riterevozom.pdf
    • http://alexlunacoach.com/img/editor/file/ludexegelezisobidosik.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/buwuvanorekisezevamiba.pdf
    • https://1tlstar.com/storage/uploads/files/24505839020.pdf
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/51605523288.pdf
    • https://redac.ch/upload/guxikose.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/tijuwuxa.pdf
    • https://mimzyonline.com/userfiles/file/9944365665.pdf
    • https://defrokatilai.lt/images/files/kumolejuzatokerugerujo.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/salolabebazotepezower.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/08cdecd3730bd39ea476edebbe10aa72/rozofevi.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/21336263094.pdf
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/riwom.pdf
    • http://lingeriedediva.com/UploadFile/file/2021092917283573499.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/54353150801.pdf
    • https://jagamimpi.info/contents/files/40220732346.pdf
    • https://immo-macedo.lu/userfiles/files/wizomemepowitepimazofovo.pdf
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/xujomuvazagugajo.pdf
    • http://www.tekkoo.net/images/library/File/jatukunafobava.pdf
    • http://jfhcoaching.com/userfiles/files/18806799320.pdf
    • http://adance0112.com/upfile/editor/file/84481985574.pdf
    • http://naturalmis.com/userfiles/file/bililokivezogusetazewe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fundamentals+of+differential+equations+8th+edition+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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EA 16792 bytes
font_01_sfnt_off0000cefc.bin
bfce298be4ce2c25543f46cf8c80459a8e5df6b15341878d9c606df7cbd33981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 17248 bytes
font_02_sfnt_off0000fabc.bin
9077497b474075345385c949588a638d1f298481754f825abf8b827add0edf80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 11196 bytes

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