Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8417bcc5ef7969d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 19:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a678805fb7d5b422229b99659b3a83b6 SHA-1: 0c75554abf47d56840ab1bbb6e05b938aeae7ab1 SHA-256: d8417bcc5ef7969d6a65f8369d4aac811a4aca7028241c2e1237fb7948e4b10d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+do+i+make+messenger+my+default+sms
    • http://otestmanager.com/club/data/userfiles/file/20210905184813.pdf
    • https://xebecdesign.com/xebec/userfiles/file/nasoxuvuxojeki.pdf
    • http://baby-daycare.com/uploads/files/202109071818079491.pdf
    • https://petpetmates.com/files/editor/file/46543035204.pdf
    • http://drsuthichai.com/userfiles/files/denin.pdf
    • http://ibb-online.ru/f/file/39823176213.pdf
    • http://cornucopiafrederick.com/uploads/files/burafomitorexe.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/levapujifan.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/saxaregetoxitenemexuvo.pdf
    • http://apsons.eu/files/file/murijajugufifolekotofe.pdf
    • http://canxetaianhduc.com/images/file/sanabexenegijawidodejudo.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/mewozutoj.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7ab4074ea2854acce69c26d78a600095/fuvonapugifedokutudar.pdf
    • http://tetrafluoro.com/upload/files/76493323126.pdf
    • https://confetti-seasons.ru/upload/files/fakazeto.pdf
    • http://1carl.com/userfiles/file/63791412948.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/21145887054.pdf
    • http://fszhenjia.com/upfolder/e/files/20210908081959.pdf
    • http://kaymccarthy.com/immagini/file/pinerugaludiv.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/23041699726.pdf
    • https://clove7.com/userfiles/file/3327743442.pdf
    • http://www.ufolep-69.com/contenus/files/lilamipufuruvisu.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wemagilolenukalerukod.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/23903931953.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d84b3c54c---36811977416.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/73566995679.pdf
    • http://autofox.lt/ckfinder/userfiles/files/riwajo.pdf
    • http://www.pattyn360.com/upload/forum/files/vobapi.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_off0000d8c7.bin
4d43fd6b5ea6912f9c7d5c511598ae7ea1b2f0f59edd89ff41d232e90aa7d7b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 18176 bytes
font_01_sfnt_off000107b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 16792 bytes
font_02_sfnt_off00011fce.bin
e290ebce8c81d8af7e70fe0dc868e0760c29e8bef79711982f98dbb5a9f21292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 11080 bytes

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