Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b206c92e08754fb…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 00:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 381d71e1320198e1b4f1e2eb9f4641e1 SHA-1: 783f8e099ea4d101b5b2df8aaa744f996fcad08b SHA-256: 4b206c92e08754fbab6fe86ec078f315b65bf77fdce455ce1dd7708e786ecca6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of these links, indicating a pattern of distributing malicious content through a network of low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://vankouwenenmastop.nl/UserFiles/file/60877002097.pdf In PDF document text
    • http://dush-kz.ru/uploads/fck/file/jikemo.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/medutomusobuga.pdfIn PDF document text
    • http://sayarbobinaj.com/file/dumebunesuzorolosujigu.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210924062617.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/22224531625.pdfIn PDF document text
    • http://pk.mo/userfiles/file/gikibifubabojelozid.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/83033761664.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67383549836.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/34256670050.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210917122325.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/potub.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/nifokeruwawoxizapopu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/zuturuwabopegoliti.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/83290596243.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d410aebc---gupadivosek.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/10539212774.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/mowinujananij.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/11259259057.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/wizexunowerugidofet.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210914050609_nfkyb4.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vedelatebabemur.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/jixazetonudivolojaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v+buggyPDF 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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 15972 bytes
SHA-256: 601f13c7b01eb8b5d06b332172e20c7bf81efd1c58c24ac857d8dd833d355b2d
font_02_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 9980 bytes
SHA-256: 464a329e4794706e14f103a1bbf4e1ad238f2a9b1e5caea2c798b3a5037be618

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