Malicious PDF — malware analysis report

Static analysis result for SHA-256 67efa49a7d390a22…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 21:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c1785468b6bbea2a3cabea3ecd0675b SHA-1: 72f51b9c388f644211a6518b2f7062d5f3e96396 SHA-256: 67efa49a7d390a22ff1037dc06b22f98bf1b0935caed9a6a67df7a2999ebf2f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains and are part of a link farm. This suggests an attempt to trick users into downloading further malicious content, likely a phishing lure or malware. 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://kingkady.com/uploadfile/files/medodogamirotowuvireluvu.pdf In PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/22993038312.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/72969355436.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/xoxabuga.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/9825381605.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/labelovumax.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/48047085227.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/jevavuj.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/zopetaralegepe.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614114fc781ef---lebukimulisekafebuka.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/fafemejesusupunazolafato.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/povekigefumiwivozul.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/47935341506.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/18479441402.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/25691119543.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/872404578.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/51310419604.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/10079887146.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/67372433009.pdfIn PDF document text
    • https://kulittelor.com/contents/files/vuzazuvebumolesa.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lapowe.pdfIn PDF document text
    • http://siroyensao.com/upload/files/97732836207.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/bodaketajafapijifozes.pdfIn PDF document text
    • https://simorgh.it/uploads/file/52257915750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+lego+ninjago+tournament+mod+apk+obbPDF link annotation
    • 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_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 11116 bytes
SHA-256: 059dc0745e57ddcc0d8efec6f5fa9262ecf0e340f1acecc7eb5016362994f671
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 19364 bytes
SHA-256: 8a713d61926426d1de565eae132017f73661b12a185074fe2bfa214a906138e5
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1