Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1979c1598e617e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-15 13:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26889bdecaea9400ab9b8ba985b9468c SHA-1: 8451623586226c566c261c42f6c8e3b78ec27ee2 SHA-256: bc1979c1598e617e901d530d2412cce76a96413b1bab8dcbd13c6859e6225285
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm or phishing infrastructure designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nexxosrealty.com/userfiles/files/noveroxeb.pdf
    • http://plncse.hu/php_data/file/54554440889.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/xusopul.pdf
    • http://bukharaatlanta.com/sites/default/files/file/66496226648.pdf
    • http://portalcom-b2b.es/img/user//file/_0317492001630826584.pdf
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914052202448730.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/rikulade.pdf
    • http://rpsbchamber.org/editorData/file/41994198788.pdf
    • https://bawauang.com/contents/files/loxaladoki.pdf
    • https://sasalidayanisma.org/uploads/file/23306047738.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9ad601b7240bcb746d6fad652e684ca7/diguko.pdf
    • https://wonwon.taipei/photo/file/dizefid.pdf
    • http://flexinform.com/hirlevel/file/keben.pdf
    • https://betenrealestate.com/sites/default/files/file/60122619517.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dffc678f8a9ee9a2b9ba082cca8f1061/30657965488.pdf
    • https://vnnc.vn/img-hdmedia/files/zatakufubufosi.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/65256991471.pdf
    • http://bright-inter.com/file_media/file_image/file/58715734991.pdf
    • https://mysilo.com/upload/ckfinder/files/relep.pdf
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/10881012792.pdf
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/89912428212.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/28308862674.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614197fa6f4eb---71113532159.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=beautiful+pic+in+spanish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
font_01_sfnt_off0000f1d6.bin
4545b9bc9a5a447e8854488c0fb3621549556991101d6dd562c5c45cb430e556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10508 bytes
font_02_sfnt_off000109a9.bin
d66e2c532b086e04dc33c40c8e2a5fdd95a45728467a2e73834c25b384aa8f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 19740 bytes

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