Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb4d9904a720bbe…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 11:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea0b7ea517cde0e9464e6196279bb5ab SHA-1: 304a70f9dee1a11254a4a3c49d595dee1d7ccff8 SHA-256: 8fb4d9904a720bbed7ad9fe59e0678c83f250a95ea93c0a5ff0cc989c23125ec
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 of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the exploitation or redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=app+for+free+tv+shows+on+android
    • http://automsystem.com/UploadFile/file/20210914021839079.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/vofezavirad.pdf
    • http://newo.ru/files/files/21718362388.pdf
    • http://xhiehchin.com/Xhieh_News/_file/muzewalinexefajelabum.pdf
    • https://tatsolarlight.com/uploads/files/belelo.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/edde121f60c077c7c1f970b3f493be36/97965173269.pdf
    • http://vnationwide.com/userfiles/files/gepomibaledusekelagawap.pdf
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/10958620206.pdf
    • http://mestan.by/images/file/33010534030.pdf
    • https://f2h63c2.ip4secure.net/upload/files/71831215103.pdf
    • https://rubfila.in/files/file/7369649999.pdf
    • https://mbzgogo.xyz/web/img/podborky/files/30847719584.pdf
    • https://raovat72.vn/uploads/news_file/roruge.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133978b6aab4---85217085931.pdf
    • http://tokyo-sanritsu.com/userfiles/file/notofufa.pdf
    • https://magyar-logyogyasz.hu/fileok/file/noxulovunofirukupesi.pdf
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/tanurisevasogezubufedixo.pdf
    • https://termoformat.md/img/files/pavololapawop.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/26287271355.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/50385489296.pdf
    • http://insfilings.com/skyzone_classic/upload/files/85352311781.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_off0000c041.bin
350aa22ebfca568f08f48227ae9b72ad1f7250aec9d18592a7aa8845bd7adec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 10680 bytes
font_01_sfnt_off0000d8ca.bin
07dc997fa6e5d9c1c6639578ccc9e3c6884a87424cba5c04d690339331618e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16504 bytes
font_02_sfnt_off00010313.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 16792 bytes

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