Malicious PDF — malware analysis report

Static analysis result for SHA-256 8063c455020cb803…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 16:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a66020e8b6d2552c720a82763644710 SHA-1: 6b61a47292106da5fcd577eb7b1c219f31dafbb0 SHA-256: 8063c455020cb8035df4807d951e859d4a54f935d7907b7db5ce64faf50216ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=rar+on+android
    • http://www.gamylai.vn/uploads/files/kuzexef.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/nigege.pdf
    • http://albertf.madteam.net/ckfinder/userfiles/files/83794396599.pdf
    • https://aawyx.com/sites/default/imageuser/file/48957763418.pdf
    • https://eqonetech.com/upload/userfiles/files/58569778389.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/4633293826.pdf
    • https://badeluxe.com/userfiles/files/15658517348.pdf
    • http://i-physiology.ru/upload/36467325769.pdf
    • http://kengosushionlineorder.com/uploads/files/wodagijitemasaza.pdf
    • https://mots.alaxarxa.cat/cmsimple/images/file/zowamafip.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/sejamu.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b3d56142---5832105081.pdf
    • http://residencecarlofelice.com/userfiles/files/7690745140.pdf
    • https://hssanesteban.cl/files/58018811618.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/xerimutaboxud.pdf
    • https://dyaa.club/uploads/file/nuselifalafanum.pdf
    • https://xn--lenachatka-57b.pl/uploaded/file/89946739475.pdf
    • http://sdv.sk/userfiles/articles/file/juzenonokumiw.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bidopititotizonudar.pdf
    • http://hrzservices.com/uploadfiles/file/38574688534.pdf
    • https://at1-turbo-j3t.com/contents/files/61577170557.pdf
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/visakuturesuja.pdf
    • http://prime42.ru/userfiles/files/lurokibafepikaborubinano.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/30db5f6c8bf8778eddc4d533dc1ddd33/jepogakisuf.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_off0000b453.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB453 16792 bytes
font_01_sfnt_off0000cc65.bin
173a60de23015a54b49bdfc6d359c9fb80b3df9de4214e24da7daa06de01664b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 15684 bytes
font_02_sfnt_off0000f46d.bin
09ff9a0f2c1f28719cbcda633207b0ac3e1553f23ec93c91f84f4e536c3ec77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 9840 bytes

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