Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d828130ea47907e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 19:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 269f675f6de89826754907168355156d SHA-1: f55bfd15ba6e62cc2673d952499cdbcc0c044399 SHA-256: 2d828130ea47907e5951fa40942282fd06f5b2b810635f617d1036cdb83cc0c6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external links, suggesting it is designed to exploit vulnerabilities or trick the user into downloading a malicious payload. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=chromecast+fire+tv+apk
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/elia09bcr10un5tk0l6i8aj8bf/jerazapojoxabonoxujim.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/pubinobugeleponeva.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381080b4e54---17016199815.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/96065191396.pdf
    • http://www.deewanalarab.com/up_imgs/49613395020.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/zewexapanetovabuzi.pdf
    • https://fontan-montag.ru/img/upload/5787762153.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c12cf30cfc---mibafepafewofeg.pdf
    • http://shipsupply.ru/userfiles/files/kimokozofawolegijuzuk.pdf
    • http://status.cz/UserFiles/File/tupidaduso.pdf
    • http://clainvest.pl/userfiles/file/zeduni.pdf
    • http://hyeminshop.com/DATA/files/20179083506.pdf
    • http://serextion2006.com/js/upload/files/kobijefomofazakavazow.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/16500425504.pdf
    • http://www.yemany.com/yemfiles/files/87519955194.pdf
    • http://www.como-grup.ro/fisiere/file/48463683467.pdf
    • http://decamiones.com/userfiles/file/mapulororadexumuj.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/duxepure.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/poluvomituvav.pdf
    • https://pacientes.quiroser.com/UserFilesQUI/file/75079340448.pdf
    • http://prograsifkalip.com/files/dugimetamenije.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_off0000d3e9.bin
1f76c63c64ad3acd2754b90ab0137eb6198852782ed76dc278bc07fd1eab7780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 10784 bytes
font_01_sfnt_off0000ecdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
font_02_sfnt_off000104f1.bin
ee8a526d7c23a99b50b882385213dc855e9ab4f8a5f2a3b831b005ace9a9a9c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 18080 bytes

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