Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4635003537237d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11f6b835bc3c4e57ae92698238ca916f SHA-1: 2e20ef0b3573c1d50608f7c641ba2ab33bd6ead0 SHA-256: 2f4635003537237d05056fbefdb09321dd58e734870d3c49262faff40720e0d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crewmak.ru/uplcv?utm_term=agario+pvp+private+server+unblocked PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08ed4eeb9---fegikidanalaged.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613277af14653---92605660686.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/guwoma.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/75411848047.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/33963663278.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/30956520605.pdfIn PDF document text
    • https://terracell.info/images/file/risemovototo.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/tetezij.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/wajetegesogajevakaju.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/76471516804.pdfIn PDF document text
    • http://imi.vc/upload/files/7557662043.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/33934893949.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/jimuwitifezixovut.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/zozazunojizifikanuv.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/konesavo.pdfIn PDF document text
    • http://guitarenko.fr/img/files/22970397203.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/radofisonavazala.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/fijurujexemuro.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/77935052973.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/98086322800.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/89738829222.pdfIn PDF document text
    • 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_off0000b01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01F 16884 bytes
SHA-256: 31d26ce28bf417b11ec3ef82254d168411c2af8d0f58fd1862e6a7a481590a1e
font_01_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 11068 bytes
SHA-256: 464102a23448c4f6d40fd686a22603d9f13b05778147ddc374c2c738ee861677
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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