Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46cb79635420c1a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 10:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c1e74e19fdc7e5d9c872606841eb322 SHA-1: 2593c33559d86f7605836c1c47d4d3cd3af10073 SHA-256: f46cb79635420c1ac7ed29e62396cb01a39569676c5bb146e1e2124389810fce
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating the PDF is designed to host many links on disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://asiantms.com/ckfinder/userfiles/files/10278991225.pdf In PDF document text
    • http://janaturismointegrato.com/uploads/file/muvajepono.pdfIn PDF document text
    • http://stl-hk.net/userfiles/zoxovivemozuwujo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/libimim.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/tazerubotiwaxixewubunizog.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zakug.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/5604435392.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/lavokamosuzaruriminizijo.pdfIn PDF document text
    • http://trivio.it/userfiles/files/41534070978.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/mugupawikidegop.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/26434922645.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/topofi.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/86721358904.pdfIn PDF document text
    • https://novitas.ro/files/pesuvamulifusez.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/63304540300.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qvev80gn5p3fktqirr0b16qjat/zarewisaj.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/joponep.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/82070912092.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/ziparivusul.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614c26ff25304---8481807437.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/tabusut.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/86200016533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=star+wars+kotor+android+modsPDF 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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10484 bytes
SHA-256: 5339af4a29d2d9929a7a35f018964fdd15f8dbd22830ece884010749c10baa34
font_02_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 18220 bytes
SHA-256: e3b61500205a325a79623970d9b585ef366bb3084df84968faa148ec631ad689