Malicious PDF — malware analysis report

Static analysis result for SHA-256 5820e99eea27cbff…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 10:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f48225d3f1e9e66faff4e8741b5c076 SHA-1: 76e7bb99528e57ddfa3effa4fd7099286589d8a9 SHA-256: 5820e99eea27cbff27d1b6da73476c667a1b426572b1175d4d404e89ea09285f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed as a link farm on disposable hosting, likely to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=papercraft+harry+potter+pdf
    • http://avvolodin.ru/upload/file/pazunudasojorupijananaxe.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fodupafedabokiwe.pdf
    • https://lecormier-menuiserie.com/www/upload/files/fopebadabilogejidasubus.pdf
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/wadagak.pdf
    • http://maybomnuocdanang.com/uploads/image/files/buwujodu.pdf
    • http://dreambeauty.kr/upload/fckeditor/file/pogike.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/lonuta.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/46593876301.pdf
    • http://ilkemymm.com/image/files/lepovidip.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/20517988216.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613efb965d308---85371850207.pdf
    • http://webbuilders.com/files/file/98334292138.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/36254513669.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5d2daa46---60673786113.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/42647108602.pdf
    • http://domusanna.it/userfiles/files/gamusogisobikibowotop.pdf
    • http://goref.ru/files/file/todofoneduvizemenabine.pdf
    • http://ominocoibaffi.it/userfiles/files/26888923342.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/verisanenuk.pdf
    • https://rotterdampools.com/contents/files/ninepotabaluvawazuroni.pdf
    • http://color-gateway.com/userfiles/file/nixemoduwerevajogafep.pdf
    • http://agisma.ru/files/pages/files/88632873772.pdf
    • http://scpt.it/userfiles/files/36555065720.pdf
    • http://ultraljud.nu/bild/files/wexodajufokif.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_off0000d5b1.bin
20d2971069233452768291545a0c2c68325d622ed4968fac4bca1cd6e669c363		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 17160 bytes
font_01_sfnt_off000101d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
font_02_sfnt_off000119ea.bin
3189e914fb38eb1d65a8bdf0a49a4d1fa7a18ad2d3abadc674a204b5d2218142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 10424 bytes

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