Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f833a8bf7fee9d5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 19:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fdcda92ce96c5982cb0e0480bc4562d SHA-1: e89dd398f494d5cb68de142fc81122e6e22455f4 SHA-256: 0f833a8bf7fee9d5b5e3a95c9313f7d91a6c38ce8dc319328ef2b2637308bdc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or scam attempt. The presence of external URIs and the overall structure indicate a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://drafthe.ru/uplcv?utm_term=gta+5+game+download+for+android+free
    • http://benthanhsgfarm.com/images/uploads/files/22357938231.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/99790364076.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/3704635824.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/wexawada.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/movukokudatelolajerog.pdf
    • http://businessvaluationapp.com/fck_files/file/vagomugereguzigo.pdf
    • https://konyaalotaksi.com/userfiles/file/6585560724.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381a02503d2---wofeguwetutuwikemi.pdf
    • http://allprintusa.com/admin/images/file/32682293514.pdf
    • https://rockeit.com/userfiles/file/zitizijilevudox.pdf
    • http://schodylux.pl/userfiles/file/mizikevomowobopajasodara.pdf
    • https://bilegt.mn/userfiles/files/64054358551.pdf
    • https://samngaimarble.com/html_upload/file/63514407588.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/wijetavenikodepaduge.pdf
    • http://baobianhkhang.com/upload/files/sofikafalok.pdf
    • http://hanaelectric.com/userData/board/file/44242964709.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/51061655906.pdf
    • http://ozdermusavirlik.net/userfiles/file/kabeke.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1631217586.pdf
    • http://888spirits.com/userfiles/file/midekurukiwomino.pdf
    • https://pyccenter.com/images/Upload/file/46311825685.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131527c8dfe7---rifox.pdf
    • https://joebalogh.ro/imagini_ws/35940398075.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jeleminozemojomuze.pdf
    • http://kag.fr/userfiles/file/nutukefirimiwevi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b4.bin
ec227806cd48a2dc115ef1a9d28061f30b51f069ac918cd3c815bcf78863b07f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 23820 bytes
font_01_sfnt_off000104cd.bin
631ca8c84f01fc1f591e278f46ffe5b63467985ac0bd5d939c135cf401a2b01d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 1712 bytes
font_02_sfnt_off00010ceb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 16792 bytes
font_03_sfnt_off00012502.bin
998dc53276316ea7306f5b3c136b997a10fdf470275356a3c0c31e6809885a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 10788 bytes

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