Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dabcfde3b65b118…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 12:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eb75571e19abd5bf70ef2877448c802 SHA-1: bd627f2ea05190581b73a82355d990b2366691ef SHA-256: 8dabcfde3b65b11854ee058b6eab62e742c851868bf7847f715879f23c56e905
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=9th+std+geometry+textbook+pdf
    • https://btegypt.com/file/rufumemujafofuze.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/68585632961.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/butesekigul.pdf
    • http://www.malagatour.es/ckfinder/userfiles/files/23894932987.pdf
    • http://turagent007.ru/userfiles/file/50308059253.pdf
    • http://saktigroup.in/uploads/87987298952.pdf
    • http://kangmeideyiliao.com/uploadfile/file///2021092022521522.pdf
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/zilezazos.pdf
    • http://firmen-bekleidung.at/userfiles/file/lejowipibu.pdf
    • http://cross-winds.in/upload/contents/images/images/32958107793.pdf
    • http://ahcxdq.com/uploads/file/152159099815.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9950a0a4e6fdb2bd24e19f12760497e4/nezisibupagag.pdf
    • https://weekendtripskolkata.com/userfiles/file/lebizus.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/28692289116.pdf
    • http://puntolinea.org/userfiles/files/miwiratonosixuraviwudafur.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96047169885.pdf
    • http://td-mg.ru/uploads/files/dakutizuwawagegisun.pdf
    • http://hotelrealerimini.it/userfiles/files/gonigevapapinovova.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59ff58857---66272749467.pdf
    • http://unicorn-furnitures.com/d/files/83603207879.pdf
    • https://chingchia.com/uploads/files/202109161843337736.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/68858537351.pdf
    • http://4darchitecture.org/img/all/gewirojuxu.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210903192714.pdf
    • https://sergiomauri.com/images/file/gixasazavovinudijelir.pdf
    • http://alarcon-v.com/editor_upload_image/file/jemilekixegorema.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/maletabugox.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_off0000d241.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 16792 bytes
font_01_sfnt_off0000ea53.bin
75264c2f79151b0112ce2aefe1e7010c8a32e4d3b9f8e8b56c898eeaa934a79f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 18352 bytes
font_02_sfnt_off00011990.bin
69c5a68993c79ddac7347a9e75ed446009c445b4b3f1d2482954c9b87acbf954		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 11060 bytes

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