Malicious PDF — malware analysis report

Static analysis result for SHA-256 272ca118466c3e9e…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce815f949e1b57f04ab5fc1e974d5531 SHA-1: cdd73ca80c53f02d82f34aaf8aea156e993a7e89 SHA-256: 272ca118466c3e9e82c8881c53bb105e0e5c39ea55e198d8bafdaaf064cb4f5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://vattucongtrinh.com/userfiles/file/8681295497.pdf
    • http://7166867.ru/ckfinder/userfiles/files/69542391103.pdf
    • http://anpo.vn/upload/files/69264522982.pdf
    • http://lab4050.com/upload/editor/file/dubagesodan.pdf
    • https://mi-stores.com/basketballtotaal/images/editor/file/16702119068.pdf
    • http://lovesenergy.com/file/57008147561.pdf
    • https://tekartltd.com/upload/files/72847209611.pdf
    • http://koovappadyscb.com/ckfinder/userfiles/files/54510583096.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/62480508755.pdf
    • https://volandovia.it/public/fileeditor/file/megipiditaxiledob.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/37319863244.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af92c6e43d---soxazeweran.pdf
    • http://riviera.az/userfiles/file/15161824166.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/tapobuzivididu.pdf
    • http://morethancars.nl/uploads/edytor/file/rabemofuxikejipaxuvobif.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/10729838815.pdf
    • http://sinhorelli.com/userfiles/file/karamobufavokifasobiv.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec62f1b76---55984799141.pdf
    • http://tantos.jp/js/upload/files/bogapope.pdf
    • https://laplacedesstores.com/upload/file/55782517364.pdf
    • http://nuuts.mn/uploads/assets/mixebigowuvexelusiv.pdf
    • http://alkanboya.com/files/file///60282205666.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/91123100726.pdf
    • http://chongqinghaohong.com/upload/files/xetuzimonir.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/punifop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=back+to+the+future+android+game
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f046.bin
2e18fe1a651d6f7324d185f73f1ea903970b2783b255b1b3cb98ac8a5e57cfab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 17024 bytes
font_01_sfnt_off00011c2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 16792 bytes
font_02_sfnt_off00013445.bin
98d8ffe3481b2ef359b7596ddd8c841691b59782078ec756adc4488963ecead5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13445 10956 bytes

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