Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e56470e2fd7b25a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 16:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03389f47deaba31c35ae0d62e4d8e66d SHA-1: 600d4027803dc700b1bf419b9cddee909197bf10 SHA-256: 4e56470e2fd7b25a52c7d281203a383eada51c7ed82cbd6962105a2efc68c32d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=divisibility+rule+of+8+with+example
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913083048.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e1c070d93eeae768b7cd3f69137cee41/55842893448.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/kipagulodo.pdf
    • http://tianlanip.com/filespath/files/20210904102032.pdf
    • https://blogsma.com/files/vumosejilodejafaxodad.pdf
    • https://pacie.vn/web/uploads/files/43641816710.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/nemubisamu.pdf
    • http://aptwash.com/userData/ebizro_board/file/jufomuxatifojav.pdf
    • https://fasaac.org/temp/files/wudafijubixewa.pdf
    • http://damutech.kz/upload/2021/09files/210914165332858312lwce2.pdf
    • https://marikakozmetika.hu/editor_up/wevawopoxosu.pdf
    • http://cuboni.com/uploadfile/hong202109151754302706.pdf
    • https://chongtham68.com/app/webroot/uploads/files/ruwelixupobofemejo.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/51347355529.pdf
    • https://stealthwindow.tw/uploads/files/202109131731417206.pdf
    • https://cvzona.lt/resources/img/files/wurupatitufuz.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0f9f50f55---10538404662.pdf
    • http://alompar.hu/uploads/content_files/files/xusininux.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/9548000919.pdf
    • http://alexdisinfestazioni.com/userfiles/files/dotorasilip.pdf
    • http://giaydantuongphongkhach.net/images/news/file/pexodiwosipale.pdf
    • http://www.ondebiz.com/userfiles/file/31208112327.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57153188893.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_off0000b2ad.bin
33fb211560e7e2623208283a805582f59e1a694dc3793549f1203ccd8fec00a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 17616 bytes
font_01_sfnt_off0000df9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 16792 bytes
font_02_sfnt_off0000f7b4.bin
4cd46f2c4da5ec5b2fbdeeb94c4fb3e51ddcf29343a9647e606b389cbfeb9376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 11336 bytes

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