Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6f7fbdaf3c850c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 15:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44189b2a392ba95c96a26c7691baff32 SHA-1: 576f27b78fbf0380d48230563167d23b60e4c7fc SHA-256: da6f7fbdaf3c850c6ddba860f40eb735b85bf2a3bf5ce82be8ce208fec2c3f52
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=gta+san+andreas+lite+download+android PDF link annotation
    • https://pvesc.vn/uploaded/file/dedebexox.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/28158915107.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/4635799885.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vojefebuxuvav.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161415b513ec23---75403562238.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/52545142528.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/fugubejevamosumotimujol.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210903215130.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/ludifa.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zazenilugimizuxavikeru.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/3105830947.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/30239815073.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/34780163843.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b686cc4ce8899f90a57bbe47ce42ac8e/zogafediduzefukoz.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/jesaxarebur.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/sezadodeta.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/supigerovifigomar.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/nogatifi.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/67512669050.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/pivekatatibexuki.pdfIn PDF document text
    • http://budropol.de/Upload/file/73975222167.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/totoxew.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/26216577948.pdfIn PDF document text
    • 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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC729 15860 bytes
SHA-256: 3c104a2d752adc0571c0babc3e6c6fe09a5061dbe631568ab01bc4ac17c16f52
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 10368 bytes
SHA-256: d8312cd70ab497c82c83992080f12ea6cfe632eb37cb416d5bbe4ce72b98681d

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