Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c3f55ae00d6aa2…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 15:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9eca0a52a8089efe8650a3ac449399ac SHA-1: 2c12577a4646dde516f49f7a9d9ab6c31d7cc9de SHA-256: 10c3f55ae00d6aa2e61bf40801c4d46e7d3ca6efe768dc78160b39eb5e63cc03
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple unknown external URIs suggests the PDF is designed to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely responsible for initiating the redirection or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ebenisterie-burette.com/ckfinder/userfiles/files/66171636148.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/gijaxesetosuxo.pdf
    • https://adikkeempat.com/contents/files/16857009964.pdf
    • https://delcinfo.ru/img/files/files/69525687356.pdf
    • https://22importexport.com/eimages/file/92649046305.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/12614482851.pdf
    • http://picart-personal.pl/fckupload/upload/file/tuxod.pdf
    • https://loyd.rs/images/file/bazikumulusorupokewoxunuz.pdf
    • http://rasciindia.com/firetech/ckupload/files/pivaguxiribim.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/3017335036.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d2a08f94---42828155711.pdf
    • http://www.lnk-creation.fr/upload/file/63345154373.pdf
    • https://speculatio.in/ci/userfiles/files/4091512544.pdf
    • http://ranjitabiswas.com/userfiles/files/21974789383.pdf
    • https://luckyfood.itweald.com/uploads/files/612edc3b48d5d.pdf
    • http://atoutslegion.com/userfiles/file/davuwas.pdf
    • http://autoscuolapezzano.it/userfiles/files/33120808475.pdf
    • http://goldenteriyaki.com/uploads/files/jaxogu.pdf
    • http://ammk.sk/userfiles/file/xidufekabuzu.pdf
    • https://trinityautorepairs.com/uploads/files/xididapot.pdf
    • http://synthecinter.com/userfiles/files/72433636333.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/90915460436.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+transfer+photos+from+iphone+to+android+phone
    • 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_off0000af6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6A 16792 bytes
font_01_sfnt_off0000c781.bin
f6018ce37b42ffc5126dffa09402815587082fc857148e9cd43a77affe67fcfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 10792 bytes
font_02_sfnt_off0000e02a.bin
411c8dc46ede05b2159e19b1b65be282dd9480c3f1832e62eb087daba5e67aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 15040 bytes

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