Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a9c7b454ccc606…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 09:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22d4bd8aacafb75373ceec572a103406 SHA-1: e1d36209ca4617159cf05767bc2e8481c86abdb4 SHA-256: f8a9c7b454ccc606d0864fc313c8314169d93e636cbe995e1b8a43022079e392
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is a common technique for executing malicious code within documents. The embedded JavaScript likely redirects the user to external URLs, as indicated by the PDF_URI heuristic and the presence of multiple URLs. One URL, http://oldadmin.k12cart.com/media/files/jitilerizodojadixi.pdf, is particularly suspicious due to its structure and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oldadmin.k12cart.com/media/files/jitilerizodojadixi.pdf
    • http://kesifveotesi.com/files/53286597554.pdf
    • https://bdaudit.ro/userfiles/file/28251953769.pdf
    • http://kartywspomnien.pl/uploads/assets/file/nanewuwusajefevaje.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/98282590742.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/97373637867.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lenegukukogizi.pdf
    • http://woodlander.sk/grafika/file/farekilonekulaxixiv.pdf
    • https://desense.eu/uploads/wysiwyg/files/29735731085.pdf
    • https://vanrun-it.nl/userfiles/files/56966490740.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/legodilani.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/63857790334.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137278f204de---zuwewudufexera.pdf
    • https://bitree.com/ckfinder/userfiles/files/87076993109.pdf
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/32813188534.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386af66b41f---sijimavanubu.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/73672911329.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/63618801002.pdf
    • http://starma.pl/files/file/rikuzumabakumufabesazola.pdf
    • http://autofactory-jin.com/js/upload/files/18500246233.pdf
    • https://yocarbroker.com/upload/ckfinder/files/levedogofanake.pdf
    • http://paradisoseminatrici.it/userfiles/files/33367287103.pdf
    • http://lulanjina.net/upload/files/kiner.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/luxufiweruriduxupux.pdf
    • http://coeb.eu/userfiles/files/molijotibagavulidugelovir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bloon+tower+defence+5+unblocked
    • 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_off0000bff3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 16792 bytes
font_01_sfnt_off0000d80a.bin
e63e8dd83c89ac792a60428e1a9e79986d9e7181212cd42ef19206f830c89407		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 10652 bytes
font_02_sfnt_off0000f0b4.bin
57c11e6b24157d14273898ccaca2f6abb5927a58013336670b9f60202a8d8007		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16036 bytes

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