Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b614373f8ac742a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 20:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aafbde6f142664d285762b82f15c2bb4 SHA-1: bbb941f0b5cfe31695ead05bb0dfc8fc07e42b35 SHA-256: 9b614373f8ac742a1011eba89ee942f014c4c698429ddbf8b235e07bc6d46e76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, and one heuristic specifically identified it as a link farm on disposable hosting. The presence of external URIs and the link farm characteristic suggest the document's primary purpose is to redirect users to potentially harmful content or exploit sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://zap-interactive.com/uploads/files/lamufidixikerekavu.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bikgvog9oqd89dp6uoh29r2r9n/47146277501.pdf
    • https://campermagazine.tv/public/file/zirazu.pdf
    • https://laurallo.com/ckfinder/userfiles/files/batevisavetagi.pdf
    • http://bannhuaduong.net/upload/files/57053703600.pdf
    • http://resetimpianti.it/reset/public/file/vakaragiguzim.pdf
    • http://land89.com/ckupload/files/xedilodusixola.pdf
    • http://health-bridge.in/upload/file/rexiju.pdf
    • http://ashokarefrigeration.com/userfiles/file/74845980172.pdf
    • http://dentalclinicbangalore.com/uploads/97905915145.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210902221532.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/gowudezasuxa.pdf
    • http://vako.vn/app/webroot/uploads/files/9710882692.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/lurelesovamakigilez.pdf
    • https://chorland-dining.com/webroot/editor-uploads/files/repolupefubibozadopu.pdf
    • https://ikansambel.com/contents/files/71915104892.pdf
    • http://berbun.com/user_img/file/nedorugowusakexa.pdf
    • http://studio70.eu/userfiles/files/mitapijoperovod.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/xiwonugabubeg.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139406e32a5d---gixiji.pdf
    • https://kolbandibileklik.com/resimler/files/89258404591.pdf
    • http://fashioneducation.ru/userfiles/file/80203765603.pdf
    • http://vitalchurchesinstitute.com/files/file/gonuxelikomakiwudodovubor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dr+driving+mod+apk+hack
    • 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_off0000d253.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16792 bytes
font_01_sfnt_off0000ea65.bin
522478c9e95931c1081e90563a356ef7544c9c7bcb4a0f9a82b61674a3ad81eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 17728 bytes
font_02_sfnt_off00011803.bin
209f4632e961449d43e1dd36279cda986003fee698c1107b390cb7862c83abc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10676 bytes

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