Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6debcde743d144…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 10:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79c148a28e6719a45c26e25642539d0b SHA-1: 0a967ba0c5b3c6bc5e5f14c509581fceb50108e1 SHA-256: de6debcde743d144c340adc93ac39dfc2cd3b3bd8a69963fe4144c11d0156b49
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests potential for further exploitation or payload delivery, although its specific function is not detailed in the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=compound+probability+worksheet+answers
    • http://hosteleriayvending.com/ckfinder/userfiles/files/juxuwo.pdf
    • http://classicalgardenstatues.com/uplds/file/gopoturojeborezix.pdf
    • https://tmtteks.com/files/wojewusawibemi.pdf
    • https://larrialdiak.es/files/galeria/files/tiniz.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/gopuravapoxijufutob.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/89889936990.pdf
    • http://uptindia.com/newsimages/file///gelovawunu.pdf
    • http://miyisz.com/mingyi/images/userfiles/file/jazulu.pdf
    • https://ctsgroups.asia/images/file/vipegumarafubefarifex.pdf
    • http://theclubburger.com/uploads/files/xexus.pdf
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/sanufatewumogevegeke.pdf
    • http://proxima-design.cz/files/file/poderowijomovipo.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/32934220592.pdf
    • https://sharjahcements.com/images/bulk_images/files/dokokasatapejadeveremesim.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/75452719768.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c2e0fa56281f6d11df36a1abab60f868/89520819946.pdf
    • https://varida-tech.com/ckfinder/userfiles/files/kufesew.pdf
    • http://zezoalza.com/ckupload/files/fetixepudimezili.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9512d2b274ea958c0d6fc4b81c05ef38/69870469212.pdf
    • http://beautifulmoda.com/userfiles/files/44757737644.pdf
    • https://reha.bg/content/upload/file/61107182866.pdf
    • http://gesundezellen.de/neu/userfiles/file/fasememagepodepudi.pdf
    • http://ourconn.com/userfiles/file/202109030441317600.pdf
    • http://wuyioutdoor.com/userfiles/file/vujomibumek.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_off0000b045.bin
e47fb381d8d2d491495e1dce91da6f4b4b3c6636ccf60a329dc1397217c8c4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 11220 bytes
font_01_sfnt_off0000ca32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 16792 bytes
font_02_sfnt_off0000e244.bin
57dd739b012e2a8968077782161464541a24c1353abd09f24065fbc35a588b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 14552 bytes

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