Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ebaa523bcb9fd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdece3b9f4d093eee97596d4f578c5df SHA-1: 7b0fa7fb720ce839348f71b243ac0d387e0f016c SHA-256: a28ebaa523bcb9fd2ce1e293e9a52bfddcd21693d7d56b7d15dd73ec4cfc0f2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://momsystem.ru/public/file/zukofim.pdf
    • https://happen.webasl.com/userfiles/file/bexisadutonowonali.pdf
    • http://bolshunoff.ru/images/wysiwyg/file/talejiwonuvutoritem.pdf
    • https://keyseries.us/userfiles/file/zalexidinizenavita.pdf
    • http://fiumaradelsossio.it/userfiles/files/12088792997.pdf
    • http://pilot-market.ru/new/files/file/64069411077.pdf
    • http://sva-jeanroze.com/xmedia/file/kazoganemo.pdf
    • http://autosoftware.company/autoresponders_images/files/nadatizedajisuvoliwapo.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xugowufe.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/tenanabitigesalab.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0cb34d8c---mivoxufejonafuvuka.pdf
    • http://denki-shonan.com/uploadsfile/sinolazosamil.pdf
    • https://gea99.com/ckfinder/userfiles/files/41993992201.pdf
    • http://aybar-gallery.com/userfiles/files/59177479186.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210920_DF062E209CFFF4A9.pdf
    • http://infosierra.es/images/editor/87048349156.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/93655983956.pdf
    • http://ltmetal.com/userfiles/files/jemigir.pdf
    • http://artechq8.com/beta/uploads/files/99696046907.pdf
    • https://zhavezbozi.cz/data/file/gowelisalositipomunan.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/93122864229.pdf
    • http://phukhoabacninh.com/images/files/kuzukuxevupagaja.pdf
    • http://hai-bi.com/uploads/files/202109080622021902.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3e55e1e2fea1ab59c73ed251352953a3/4381642207.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=login+design+for+android+app
    • 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_off0000ed9e.bin
81a8310aa1e6d58eae389cfb06f81a8bfc0e705252e5cc7e6a44532d0c6c6a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 10488 bytes
font_01_sfnt_off00010554.bin
59ca70c0f55600761c862f982f091a0aab629ec416170c0d8d5ef6ce89c8b8e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 17216 bytes
font_02_sfnt_off000131cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CF 16792 bytes

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