Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfea15ef5c83599…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9b975f57c982452e357a91f2d9ffae9 SHA-1: 133cd6634ef413c4aaff2d27e0c55738ebeb0914 SHA-256: cbfea15ef5c83599845f154a240df753a1ef54b60cdbbcb52e38f085b2bf283d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with common phishing and malware distribution tactics.

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 https://chcial.ru/uplcv?utm_term=cinema+apk+for+xbox+one PDF link annotation
    • http://runhouchem.com/upload/files/21482661528.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/24878049317.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/72219396641.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/95cc12b67836bf463c27db51b827fb95/58185823262.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/98932590173.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/bezesumuroni.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/bejoxa.pdfIn PDF document text
    • http://baove24h.org/upload/files/99223375222.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16150a70f72074---95172246340.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/95444719080.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/rujotiwatabakenatogoma.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/21301569577.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/63463549705.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/91471331415.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/25207527336.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/jesepapisofonemug.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/jusanegebixow.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/57589563583.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/91896982957.pdfIn PDF document text
    • http://373113.linker.tw/files/xufixibigutefobavuxuvev.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/94589732827.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/84309889376.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/fojojibepagajixomo.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_off0000b05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05C 10572 bytes
SHA-256: 1eb5a674dbcec496e2070c38cd58f65502199c41e90b76a9bb3949b24f4af937
font_01_sfnt_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 15072 bytes
SHA-256: 8bda064ce19017235bdb0cb4c2ddbd557d7b763619bf6fd8d7d6d7ccd2cd0e1d
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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