Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b2cac85a10c0ef…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 00:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e78ce881b940ce8832bfca98ada5e68 SHA-1: 86b961a3adf93db44349147800288974b123c1d7 SHA-256: 23b2cac85a10c0ef15ea773462951c05ce10b9d3df7bd545672564e00d154f55
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It employs social engineering lures, instructing the user to install remote support tools or browser extensions, a common tactic for credential theft or malware delivery. The document also contains numerous links to external PDF files, suggesting it may be part of a larger phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://rajatotogroup3.com/contents/files/mobupozonap.pdf In PDF document text
    • http://mywayrtk.org/userfiles/file/jiwogoniminazovusakeve.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nudazemarenisekivekiw.pdfIn PDF document text
    • https://kar360.com/resimler/files/24501858247.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/fazutimalekonewuxu.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///xulebomodinivolazan.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/42b8d04eefb0d262849491f543d25047/13006044097.pdfIn PDF document text
    • https://partnermind.cz/images/files/tanasefakuselobakanim.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/masorojetifiw.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/muxijo.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/papososopesudub.pdfIn PDF document text
    • http://kco.su/userfiles/file/29455819293.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_90E86FB932A76804.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/pozevajejigefabezut.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/67436754370.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/sopumaloz.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/totisuvosezabidisatudadek.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/pajolapufexarir.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/91283603388.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/turabivowizamefoxubobili.pdfIn PDF document text
    • http://mobitransjogja.com/files/58562425384.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/tazinutedegawutato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=task+manager+chrome+shortcutPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 19104 bytes
SHA-256: fc125ff744a4189fe794bd3885b100cbd651aa38bba0e8c33071eba18eed8cd4
font_01_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 10696 bytes
SHA-256: 641e199c77b32fa91c94693e35e7a780766d8bb17f68e1a17eee81292ff45df2
font_02_sfnt_off00013386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1