Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28d134114a827bf…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 21:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10d1d5ac36b35316ba1b425c8dd7c6bb SHA-1: fb6c6c10b7722709fff3a1da1efa1f3730c712da SHA-256: f28d134114a827bffe246bbca125a361ae741e80be0d2740f781cae33ece313b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a phishing or malicious redirection scheme. ClamAV detection and ML classification strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifofit.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a11228d2---netumifimezevapil.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vitidaxutelo.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/58641376924.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/bulav.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/58240193785.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/51789182127.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/nofuw.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/kasesul.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/39458426804.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/92970386424.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/85597515511.pdfIn PDF document text
    • https://yellowstonewildlife.com/lanevixusoxu.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kitodaponixi.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/81083678909.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/ronakeweruwivonakexuzuzo.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/39981962418.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/46689267033.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/jubuvikofudot.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditutiva.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/womawabuxofazukavuketa.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/25258470369.pdfIn PDF document text
    • http://jljemc.com/upload/files/45812812325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hide+photos+on+your+phonePDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 10572 bytes
SHA-256: 0fc6a69dc14884943110417967f3dbeb205fba7898fd9446a5ab9c889dc1dbe2
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 17604 bytes
SHA-256: 664bfd5e3d293abe081e9de0fb00ffbe7091292c83ca0c807b3dc1c1221d9cb3

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