Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06b5c90ef309aa0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 14:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c28fba71510f72423724f4572de10727 SHA-1: f499ce1dd3561ccc92ac28b1f5e706b96badfb1f SHA-256: f06b5c90ef309aa047e7ad69d7e20996430f509e9ea551fc6fb35697063fd584
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick the user into installing something harmful. The embedded URLs point to suspicious domains, likely serving as landing pages or download sources for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://oniceh.ru/uplcv?utm_term=install+steam+on+chromebook+2020
    • http://hladonural.ru/upload_picture/mojirazawage.pdf
    • http://proclima-membranes.ru/userfiles/file/fekemiwesovevoleme.pdf
    • http://daehwa.info/uploaded/file/tevadowora.pdf
    • http://lyzebrno.cz/userfiles/file/navobinosatufaxidowu.pdf
    • http://duocthientam.com/uploads/ckfinder/files/97312326662.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138599ad6637---bojakasisusilup.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/31746553949.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/j1etueu22dndplra9mhcrr62nj/zekukidigusitomekoz.pdf
    • https://brakos.it/file/15915238122.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/68623852757.pdf
    • https://zmiz.hr/userfiles/file/99691125736.pdf
    • http://baggiez.net/userfiles/file/judidizebuxirewovutimi.pdf
    • http://hzxf.com/images/upload/File/95718859797.pdf
    • http://absolutelyneon.com/userfiles/file/48207077976.pdf
    • http://fivelscope.net/fckimages/76180415469.pdf
    • http://lorichphoto.com/pictures/file/vebiguwipuxaxexinosat.pdf
    • http://gramercygrand.ru/files/file/18010204853.pdf
    • https://ctyhoanongangiang.com/userfiles/file/20827612159.pdf
    • http://cartopack.be/Images/file/43271816913.pdf
    • https://vannordenvastgoed.nl/userfiles/file/86440125589.pdf
    • http://telektrans.hu/editor_up/74019234173.pdf
    • http://cissi.it/userfiles/files/legosi.pdf
    • http://belv.ru/userfiles/file/62709069272.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/37122200942.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_off0000d8be.bin
edf51c3676ca15442a675382be6d442e1cefd6d1b82ccfc00fc253e0b5d7c3cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 17892 bytes
font_01_sfnt_off00010713.bin
711bcc31e1ae9e6882f02fb21e6a39417783fc7d57adb4cc00aced1a5709758d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10828 bytes
font_02_sfnt_off00011ff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes

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