Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e5ad94d67602f1…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 03:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e487cafb41b1a3806f76fae120232251 SHA-1: 6f3cf37f4d0a16466f48cc84ecc7f7a60714e5d5 SHA-256: b5e5ad94d67602f1a001ceeb91679db75be98546e98aa2ad018163f63d4ae696
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and multiple unknown URLs were extracted, suggesting a redirection or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bl4ia97p21ft93ju7uikactm35/kozixekox.pdf In PDF document text
    • https://kaisar168.com/contents/files/74477276028.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/marob.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f61548b44---38422171150.pdfIn PDF document text
    • https://angkagenap.com/contents/files/zewom.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/guxesajevebepemopo.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/zijatimajudonuxiparulene.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/8924806048.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/mozadujupemomarosit.pdfIn PDF document text
    • http://cobmedia.hu/include/josugi.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/mosigalafubima.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/24323872253.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/49871127293.pdfIn PDF document text
    • https://maturana.cl/upload/file/17953380791.pdfIn PDF document text
    • http://ilkemymm.com/image/files/wirotovawipesanul.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/vugide.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/77302800092.pdfIn PDF document text
    • https://digireg.nz/upload/68406306111.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/mewodimudatevufege.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/12386766687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ou+malayalam+wordsPDF 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_off0000ad7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7D 10308 bytes
SHA-256: 39d1559a00ae69d31ba50b3ec768fc9d65a6900fa8426d7009a35899c56db9aa
font_01_sfnt_off0000c4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CD 15848 bytes
SHA-256: 9038ae80f073087fea11f065bd8de6f56abb5d1d7f5c0412f9ba9ad94d4ba27e
font_02_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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