Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc55a8e8dab1e4d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 01:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fa2eb9e9d161b80c86315bb5ca50946 SHA-1: fb924816990ba4f69b0e5df142815fb2a312c72a SHA-256: bfc55a8e8dab1e4d21be78ee90196f35865cd1618e00b8d41feabda9f663b0f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://unicorn.mn/js/ckfinder/userfiles/files/29351353096.pdf
    • http://provia-events.de/pics/fotos/1/file/raverifo.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/berovukemidufufizam.pdf
    • http://thibidi.vinadesign.info/uploads/images/files/gegenasuweku.pdf
    • http://www.truca-taoules.com/ckfinder/userfiles/files/20778127150.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/niwataxutekolawobuj.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kaxedexufa.pdf
    • https://houstoncoinclub.org/FCKeditor/file/97120205614.pdf
    • http://life-homeshop.com/asset/uploads/files/daduv.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/37665062821.pdf
    • http://teplorium.su/userfiles/file/vesumugexila.pdf
    • http://thumpamonpally.com/userfiles/file/lerirokew.pdf
    • https://mayxaydunghoangphuc.com/userfiles/files/zozuborob.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143661e0adc2---pasexa.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/98201650133.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tjlppm07inog5pnordpm1atvp4/38701703670.pdf
    • http://techcessgroups.com/userfiles/file/27367580146.pdf
    • http://debsecond.net/UserFiles/File/89717672878.pdf
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/teradisodamilepex.pdf
    • http://drivingschool-brno.eu/files/97058843836.pdf
    • http://designbyjoseph.com/uploads/File/tatuxijoselojanotig.pdf
    • http://agisinfo.ru/uploads/content/files/dorodama.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/80894556714.pdf
    • http://rrbrentacars.com/files/others/wabevavoxitarumux.pdf
    • http://tandartsindex.nl/images/uploads/94616535652.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=a+quiet+place+2+online+free+full+movie
    • 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_off0000d88d.bin
6d18e0150b557f12bb328d9254783952990d10552af3cd54074a5ecf937a3a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 17308 bytes
font_01_sfnt_off00010543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16792 bytes
font_02_sfnt_off00011d5a.bin
8baf68d397f7de96f12b1a964cc6ac0138fb5ff8ad010949af688a74e2c1b57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 10884 bytes

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