Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c85dcbe9dc2275…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 14:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7c402a35e916a29d35153697291b357 SHA-1: 5c29ee5d04f8a26d2e2e77e3c5174d1b8df4d61f SHA-256: f7c85dcbe9dc2275e32fed01eb5f206e25e1fed4779e911883273ace4e30467e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and an external URI pointing to a suspicious domain, strongly indicating a phishing attempt. ClamAV and ML classifiers also flagged this file as malicious. The embedded JavaScript likely facilitates the redirection to the malicious URL, which is designed to phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=how+many+shots+to+get+alcohol+poisoning
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d215331a9cab1cecec8c6645d589f2b7/15409786041.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993c9593118---nutulexejipekakobaneru.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734bde4e9b4---67118611709.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb811ca400---48864486067.pdf
    • http://e-cluny.cz/UserFiles/file/89653345374.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58800550d---tamularatenoweb.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c035ce9ef---15889379461.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/67994048127.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b128169004e---fegizawajifavigujagu.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/45473825293.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lb6jatt9n3jnnsoqgskp0fjt3p/pepaxavopunixijewixuma.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701c66e9fd---73064900853.pdf
    • http://beulahcooleycollection.com/clients/870349/File/21999331551.pdf
    • http://stroisvias.ru/userfiles/file/novevumubuteze.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db79a6b5f---20800686567.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0491b01f---28566910974.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_off0000e377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 16792 bytes
font_01_sfnt_off0000fb89.bin
c5b947dfeca9e54d1e97f01ee58b687b2168b4e280f80e94e4ed740733a8d343		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 17500 bytes
font_02_sfnt_off00012947.bin
ae8f4f3671594381eb5a8be4881c6995c5ddc33129c9ace1c6ad8cc6cb4eca5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 10912 bytes

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