Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9a37fe966a127c…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 05:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50404e05870dbe26ca2375a102366874 SHA-1: f30d145df374513e109c039f0651a1e247461fc8 SHA-256: df9a37fe966a127cb122ded85aa397959ebc7e319b1ae5c9a085e2023e62bee3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bugskin.org/userfiles/file/torupikezuzoridorigovofi.pdf
    • https://alaskaproauto.net/nbloom/fckuploads/file/mewelubu.pdf
    • http://tucsokszekszard.hu/images/news/file/76437476363.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/19600300135.pdf
    • https://dom4m.lv/userfiles/files/vitomululideg.pdf
    • https://yogaspotny.com/userfiles/file/80531968621.pdf
    • http://naosgym.com/userfiles/files/xonadasuzinekugipepovimad.pdf
    • https://mysilo.com/upload/ckfinder/files/53355989609.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/galiwitaxomonewijag.pdf
    • http://studiotipaldo.com/userfiles/files/nawabe.pdf
    • http://mindentudor.hu/userfiles/file/sosewijubipipup.pdf
    • http://caycanhtuyhien.com/uploads/image/files/tigawiwuxukegabimonufum.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/63746071117.pdf
    • https://interference.ajoda.eu/userfiles/files/20853865686.pdf
    • https://10s317.com/uploads/files/202109140406182760.pdf
    • http://movietek.vn/hinh-anh/files/gumavasitamumo.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6bd9921a9---godafejisuwofufusasuwomag.pdf
    • http://iswii.net/ckfinder/userfiles/files/78548814318.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/xubizoparul.pdf
    • http://kryotherapie.net/neu/userfiles/file/jadunivewokoxu.pdf
    • https://ww150007.linebot.net/upfile/files/20210923064538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vengeance+paladin+5e
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gexojiwukepefexew.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_off0000aec7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 16792 bytes
font_01_sfnt_off0000c6d9.bin
6e9aa515411e4851c3114d38c2b7d97c153131ba0624d13fd9bd80237fa54352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 14668 bytes
font_02_sfnt_off0000ebff.bin
f6add4e26e178b46b54fcb3ac7ff458f78c5330c9825b5d0da82b832057fab1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 10304 bytes

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