Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47166ff9e22915d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 21:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a3380e6cda0539d6ab5686679b8f82a SHA-1: 8b920a364cf1b22c03b491d2ddd73aecfa9ab6e2 SHA-256: c47166ff9e22915de9ae212179d37b6770439cc53958a0ea0ebb4c438999a1b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links pointing to disposable hosting, consistent with phishing or spam campaigns.

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 https://cructi.ru/uplcv?utm_term=ghost+town+movie+ricky+gervais PDF link annotation
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/12514483845.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/rogujaxi.pdfIn PDF document text
    • http://rrarental.org/upload/file/moferunojegemivusosimom.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-20/20210920160335488131.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/ludulopedusumu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_131949.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f717e09465---94291572489.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/kijikeru.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20584893340.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/58867028040.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/94544053525.pdfIn PDF document text
    • http://friulanapanini.com/images/file/62255971342.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/71761328151.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/tepumokurabisokoje.pdfIn PDF document text
    • https://pcetravel.com/files/file/sojenoxejulipunuluwaw.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/39726267471.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/20781689544.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nusatedunoluwitanat.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/piwajub.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vipatodopemuj.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/13106014068.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/wibujaxutefegirona.pdfIn PDF document text
    • http://cwesp.biz/upload/file/komaxew.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/xomobenezawejezu.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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 18708 bytes
SHA-256: 948adf6db9311be12967994fb7ec2d025ebbec299f1a4e9dd19766177b69c776
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 11028 bytes
SHA-256: 7a99be86fb13bf76e04205c2c8c2181127cf59e49f8694b8d6fece521c934b3c
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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