Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcca782ee9b3c0c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 03:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1013276059136ceac71eb40bee90a675 SHA-1: 688f759eb9eb3b87e83f0aa64e09cce9b3f0f2a2 SHA-256: 4bcca782ee9b3c0cbf6f2780487e90801eb2d04ce24d471790d8c29320cdf307
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of multiple external links and the overall structure point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=remote+gsmedge+apk+6.0
    • http://thesciencenetwork.org/uploads/files/kusupibexaxazovejili.pdf
    • http://accessiblevehicleservices.com/userfiles/file/43441025412.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/50809466243.pdf
    • http://gkz-crimea.ru/userfiles/file/gutoxobokateluj.pdf
    • https://tainandentist.com/uploads/files/202109050007549360.pdf
    • http://flagrant-desir.com/userfiles/file/82462112781.pdf
    • http://ancient-theater.gr/media/file/deselunigev.pdf
    • https://btsis.com/upload/ckfinder/files/42968861259.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/34485759503.pdf
    • http://zenkatsu.dk/files/wibasudoxix.pdf
    • http://kcpsystem.com/userData/board/file/kutezabom.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161366f7fe696c---kivedu.pdf
    • https://underworldgear.com/admin/images/fckImg/file/doreriwupizi.pdf
    • http://diadiemvui.com/upload/files/6437225516.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/41629944960.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/46311198516.pdf
    • http://ratchadatitan.com/UserFiles/File/2916635176.pdf
    • http://vikingpaint.com/user_file/file/gobubetatetusovudip.pdf
    • http://myapartment.de/web/editor/files/rurobiretixij.pdf
    • http://nousgarage.com/userfiles/file/68842570637.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_off0000dbb3.bin
e38236199d7a584311c7478f15cd7e12e8ddfe4d0c0b5b1e574f4460df776afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 10888 bytes
font_01_sfnt_off0000f4c8.bin
d87b6c971cb3c30c16c7657e7c87bc8c8c1c2b88186e6f03b1fd9e9ce790771d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 18448 bytes
font_02_sfnt_off00012509.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 16792 bytes

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