Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8c54f15fccce92…

MALICIOUS

PDF

78.0 KB Created: 2021-10-11 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d89e4c32301bb6066f6be790529902ef SHA-1: d23780e0c1453b2fdaf644dd5c079bc6eebbfb33 SHA-256: 3a8c54f15fccce92e1b54e29e0d05c4dfec6989558603b2fa743f55765d2f1e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=international+journal+of+educational+management+pdf PDF link annotation
    • http://jagdrevier.hu/upload/images/file/guxipotekutidunusazeduw.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/bokipezakuzijileduzara.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/38605050473.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/6489718999.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/72025170203.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20211006082136.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/90842935723.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/vuxusasesodudizijol.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/44851090239.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/85252801867.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210918040028.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/xadefupajadopinedebavanuj.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/siwivodamuxikebaberewa.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/27676223399.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/17093365855.pdfIn PDF document text
    • http://firegallery.ru/img/upload/43966220977.pdfIn PDF document text
    • http://idcla.net/upload/files/xapuzozuzusen.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/83941055300.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/jerixaxozagejo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141fbf1e5ea9---sozikovelemeki.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/18722030949.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/51431903855.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_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 10976 bytes
SHA-256: 3beab209a128e444bccff1d6ef7320a138f51e7f5b1548fcfdc8d5ca1b981c48
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 18116 bytes
SHA-256: 39f3bb886857feb53b7af613ac85bba75216d274a770e861b90624376d68549f
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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