Malicious PDF — malware analysis report

Static analysis result for SHA-256 9029a17aa90972a9…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 05:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8308ac6bf195d8ef9c2af687f1df7a34 SHA-1: a67108cce916f759951c40373bf8b1006df2930a SHA-256: 9029a17aa90972a97a2a8fffe64a19ac0598d6366dd27722195f1371efea5060
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://managedentalclinic.com/ckfinder/userfiles/files/29908747326.pdf
    • https://owop.challengersports.com/userfiles/files/97197513258.pdf
    • http://bortran.com/upload/image/file/20210922034434.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/76708579790.pdf
    • http://jysfh.com/upload_fck/file/2021-9-22/20210922222944707553.pdf
    • http://thermogroup.ru/uploads/files/vepurotomalixuz.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/20180669288.pdf
    • http://www.domplit2006.ru/ckfinder/userfiles/files/66329352737.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gcdi4i5pmckjq55obs5er311a7/4797935510.pdf
    • http://blueview.nl/app/webroot/files/userfiles/files/jetilozejonawa.pdf
    • http://studiorestagno.eu/userfiles/files/61883940042.pdf
    • http://elsekmont.eu/userfiles/file/kibipegipeminivafopopof.pdf
    • https://renesens21.com/ressources/upload/files/wixugujexawuw.pdf
    • https://luminex.pl/upload/file/6913912838.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zeborurosu.pdf
    • http://huijingweb.com/upload_fck/file/2021-9-21/20210921053643677853.pdf
    • https://ladachess.ru/userfiles/file/gavekiwuriravaxipofamodi.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32214922333.pdf
    • http://abwalabamaave.com/uploads/files/niliwesikalokafujebuziv.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613666b87b32e---menerafefafomevo.pdf
    • https://batikatravels.com/userfiles/file/87864519641.pdf
    • http://alwaditrading.com/userfiles/files/biniku.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/82633156027.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/930fbe52d368341b92148b3741423416/dobux.pdf
    • https://peterdegendt.be/file/bolepo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+discovery+of+grounded+theory+strategies+for+qualitative+research+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_off0000b522.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 16792 bytes
font_01_sfnt_off0000cd39.bin
bb58d21ddd33ea8623d395f1eaf5352cd4d1797f71a86da77ad8097731f126e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 11288 bytes
font_02_sfnt_off0000e737.bin
6e9d49baaefa74b8b3f44bf6943614a04a9f0647f9026df7273191fc4d7144b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 16264 bytes

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