Malicious PDF — malware analysis report

Static analysis result for SHA-256 41183c4574142826…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 16:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae1394a2bb2eba20ad958f0c9aca7efb SHA-1: 76043f94b42a682bc8049824f05408ad2e4ca713 SHA-256: 41183c4574142826e4d631ae2c4c0c8fd896cfff5b93751801a788c4271c0cde
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and exhibits characteristics of a link farm, suggesting it is designed to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update, a common social engineering tactic for credential theft or malware installation. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 http://hkbroadwin.com/userfiles/10149817704.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d5c15f4fefd9ae50f55f76a79be7aad2/sogebugojev.pdf
    • http://gs-metals.com/filespath/files/20210911010916.pdf
    • http://puebloexec.com/userfiles/file/xekufakawavewa.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/65002537190.pdf
    • http://anaminfo.com/attachfile/file/12655438885.pdf
    • http://alacartedesign.de/userfiles/file/18041265464.pdf
    • https://girisimhaber.com/uploads/file/60929044111.pdf
    • https://sklepbonus.pl/userfiles/file/mifubijap.pdf
    • https://sklepbonus.eu/userfiles/file/90685834093.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf770e6dd---25730555863.pdf
    • http://club-integra.ru/userfiles/file/jedagorawutewijupofu.pdf
    • https://vjlabor.pitscovn.com/uploads/Upload/files/visis.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/35023267437.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134566f23fb1---33423657964.pdf
    • https://mccartha-cobb.com/userfiles/files/kopim.pdf
    • http://marine-inox.com/i/File/26149876192.pdf
    • http://schubert-hh.de/image/file/jonanuporakuwiwulisama.pdf
    • http://doktor-okonski.pl/uploadimg/file/novugajimiwurogu.pdf
    • http://studiorapizza.it/userfiles/files/vabusuzagitikizozob.pdf
    • https://by-express.com/upfiles/editor/files/96234173533.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+usb+debugging+mode+on+android
    • 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_off0000d0f9.bin
c55597b2effcbf5161d281add00c70483fe602994e7ebc5575ce44cada3c4d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 10880 bytes
font_01_sfnt_off0000e9b7.bin
a1b2a323101eb772d55ed8448289bd199011b454a922b59a02e524483fde0c13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 18712 bytes
font_02_sfnt_off00011aaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes

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