Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde4be78670ed52c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-30 12:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9e06066150d1d17269167d7a29c3ff SHA-1: b3efa44e2ceb4fa45618685376736c8c4ee97f22 SHA-256: dde4be78670ed52cd7d88cdf6cc5f1bc197a0af78a5b2570d214c74578f2ef43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a URL such as https://coretry.ru/uplcv?utm_term=avdmanager+delete+avd, which is characteristic of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=avdmanager+delete+avd
    • http://lab4050.com/upload/editor/file/diwudegamiligodakim.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/41187425226.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/koxekewebi.pdf
    • http://focalthai.com/file_media/file_image/file/35592240213.pdf
    • http://sanraimundo.cl/dyn/uploads/file/nasuwuregajesofob.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f25251289---bazaluloliwen.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/28600817831.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/588dd63dbce43b12d3e67443e115d50d/81017924866.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/tivazagu.pdf
    • http://sun-apartments.pl/data/pages/sezajotezugu.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/sikodoforoj.pdf
    • http://anipetkingdom.com/webroot/img/files/sazepilanus.pdf
    • https://1am130r6h1n1-k11a7.com/contents/files/61569181315.pdf
    • http://wwpokebar.com/uploads/files/65146150626.pdf
    • http://dyglas.com/userData/board/file/lovaluparixojofujax.pdf
    • http://3dprofi.net/images/uploads/file/50488739311.pdf
    • http://sswjeans.com/files/pekazarawuzanob.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/peramenivefidetidopo.pdf
    • http://mxag.com/upload/browse/file/xowojuxiz.pdf
    • http://bige.vn/uploads/userfiles/file/lutaxajumu.pdf
    • http://www.agot.pl/upload/file/17878695814.pdf
    • https://cargotavio.ru/files/file/monaravo.pdf
    • http://etcpremium.com/userfiles/files/gizibetawakogeti.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/zaneba.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/9372716135.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_off0000c804.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16792 bytes
font_01_sfnt_off0000e016.bin
1ca84225e186e60c5819140dbbd0cdebc792697de5024ff7c52308cec658bb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 21720 bytes
font_02_sfnt_off00011a48.bin
3087b4574b9b5274ca8a845681525413e9d16b51aaf38cf61fa1fd431b4373db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10256 bytes

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