Malicious PDF — malware analysis report

Static analysis result for SHA-256 b476840addde9523…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 17:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf4f00088688ca4eca9f7a05d5e41cc5 SHA-1: c0e8f11cd956df8104e131f0350245d11630254a SHA-256: b476840addde95232d1ec914e3bff9c6ff5da8fa18b70c6a065b030419ebe387
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, likely to trick users into downloading further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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 http://premiumdrinks.eu/userfiles/raguni.pdf In PDF document text
    • http://z-sinpro.com/upload/files/subimepezejeloramurid.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/81344055375.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/kosujudux.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/32747728244.pdfIn PDF document text
    • https://kimcert.org/E/file/22421492423.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210904_0C631CB55BF5D4DD.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57696905810.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/16906961275.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/67966317467.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/41027370279.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/15222935156.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/razexadoxudu.pdfIn PDF document text
    • https://allianztc.ro/files/file/lebajamejikudiw.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/wesavovoxozujuz.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/46888369129.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/zifatosileri.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136061cd3564---14594770022.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/kewivinazomilol.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/95444001800.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/67602117083.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kazonaralasedazifavizogix.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903055751.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/9m1d3lju5d71q6jgik58b6pfht/netimobapufanagawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+music+downloader+is+best+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 11060 bytes
SHA-256: ccd0245497f0f0238464f775f18ebb9aefb696f40bcc8ed8d65e1fc1fe9a5b1d
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 18828 bytes
SHA-256: c37875631cc33a3584e6f37ee1c86bb93afef765c2682d0867eedbb88b9dcf7c
font_02_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1