Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b3fc4fa736ec97…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 22:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 516a06c1b3a7028edbaa1d1ca8692f5c SHA-1: 1a06cda59ed98218cf95052c6438f4273e34c6c7 SHA-256: b7b3fc4fa736ec97bacab1dfc0b55d2eb67f665a9862bd27326fc9f17f1e7126
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://cytokin.ca/upload/editor/file/jatugowej.pdf
    • http://www.saletime.gr/admin/fckfiles/file/zibosijitos.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jadotos.pdf
    • http://ownlines.com/upfiles/file/90985362535.pdf
    • http://21cedu.com/pds/userfiles/files/23665414887.pdf
    • https://eprobatdz.com/ckfinder/userfiles/files/xibanakojugetolinomexafaw.pdf
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mefixi.pdf
    • https://mandarinkinesiska.com/userfiles/file/fusitolozeduzeliro.pdf
    • http://laboratorioshamalab.com/userfiles/file/63775850978.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c0001fcf---23696795538.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/44612327237.pdf
    • http://hwayinn.com/image/files/20210911_082912.pdf
    • http://honda-vo.com/upload/file/91797118724.pdf
    • http://home-hj.com/up_photo/file/dubedeletunaduxafubawode.pdf
    • http://ck-buhgalter.ru/userfiles/file/lozodunebidufapu.pdf
    • http://altiro.nl/home/tjerk/file/66055076118.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/44495719853.pdf
    • http://michardardillier.com/ckfinder/userfiles/files/66213213051.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ca6a2204---sevutakuluvi.pdf
    • http://sushinamu.com/uploads/files/buxolasobijedevodidex.pdf
    • https://episcopiaoradiei.ro/files/jinifupilosaxifode.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/xujafonaferijatexigusaw.pdf
    • http://tlw.ro/UserFiles/file/xikajutazivorarajogojazo.pdf
    • http://3t-t.com/User_File/UpFile/file/20210903023159_NTY4NTcwNzE2MzE=.pdf
    • http://nordicwalkingturak.hu/_user/file/siserasevid.pdf
    • http://asupuro.com/user_data/image/file/dugifezozirorovewa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=juegos+android+apk+mod
    • 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_off0000cc49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 16792 bytes
font_01_sfnt_off0000e45b.bin
9b334a001291d497f23fe9bd6b1dce91cf627a4cbe05f2ee02edc7f3308fb421		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 17224 bytes
font_02_sfnt_off0001110d.bin
7b270f9664bced60b6e5b52f3de7498229f355435849e48b5e39db0eb8c89e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 10776 bytes

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