Malicious PDF — malware analysis report

Static analysis result for SHA-256 24375e961836cb04…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 19:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ab80a19997bdaf28c4e89914b41bef32 SHA-1: ab7bb6eea437953a0b70fc2c99673249d2a221e3 SHA-256: 24375e961836cb04665607e71212ef6328fbb90d9834cbda8dd3902eb83993fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous external links, many pointing to unknown domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful external content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jjcfurnituremaker.com/userfiles/files/9976092458.pdf In PDF document text
    • https://tatvan.in/userfiles/file/juluwunasuvosewumafapa.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/80629614791.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/63745685091.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/2374685397.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/8198739816.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87770743176.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/31517816475.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nirobebejubevitogara.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/jebagofadepep.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7fc47bf---jasep.pdfIn PDF document text
    • http://kasand.com/userfiles/disawujuza.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/89373418815.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/luzufekevuz.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/gulawerevepezadepidutas.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/73268342467.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/fanidotowodosipevoduk.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090724558_849263729.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b97ee914fac5d073ab3b6852e6950f23/wupajume.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/rekoxawotu.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/70715443901.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/71166873340.pdfIn PDF document text
    • https://panoramabyty.cz/content/zulinejagebitivus.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631521774vodufu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/zomidemuvosawosukazifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=age+of+empires+for+android+tabletPDF 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 10964 bytes
SHA-256: 716a7ace0a04c43478ea4a32599d85973040ff8fe912ebd7341d4756d5467b40
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 18916 bytes
SHA-256: 18dcafb4bc3140b75020da9b386b5e03ddcd7f8285374c6238a78e713f6fbc92
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1