Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdcfbeebf6359f2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 11:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d074c7f9e43fa3f1653a12d3546f718 SHA-1: 2811b1e68c4849e11e5d6ec5735939612f1a6f65 SHA-256: ecdcfbeebf6359f2f04ff0fd29600529e5fb4b1fd16f1aae2e526638cb5ec706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=moto+g3+rom PDF link annotation
    • https://aedwea.com/upload/foto/3412337255.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/tudowasakolereku.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/nitulelevavufowilunixi.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/44633407980.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b371835a52---wokotolimugo.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/90985250652.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/2732617342.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/sevegaligusizixozefubas.pdfIn PDF document text
    • https://luminex.pl/upload/file/69497016341.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/sixalarinotomixirixukuf.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/gemadinugariratilorutito.pdfIn PDF document text
    • http://swhos.com/upload/files/69569661983.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/mokipedukuf.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/84224393461.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/25995669134.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pigud.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/vosekemibij.pdfIn PDF document text
    • https://ocw.tw/uploads/files/risulomixuwedanegumesigox.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210902150529704707k5t8c.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/bikulazam.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/15961006568.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/3472882168.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/kulomus.pdfIn PDF document text
    • http://aven.su/userfiles/file/zowadewoxedat.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cae5c71f8---66115634627.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_off0000c546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC546 17084 bytes
SHA-256: 63faff17150aa36ff3b26ce54bd0883526fc550e08cbd1e5b41a0c02319f87e9
font_01_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 9912 bytes
SHA-256: 67beffd0817d07aea184c2516353d1fca831e2843e9414dadfefd1f743429a6e
font_02_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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