Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2be393788af892…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ada859cf08e4ae673d295782a7bd3e6 SHA-1: 2a0883cb94df4cc04a12bb855948a37537e6652f SHA-256: 7e2be393788af8922c46e54d96be72f8b18708f4562ee475fdda8dbdf3c24739
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious activity. It also features a high number of external URIs, many pointing to disposable domains, suggesting a link farm designed to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://bluebiz.kr/userData/board/file/tuwikunobi.pdf In PDF document text
    • http://tobn56.com/UpFiles/file/gugosuduj.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zaxufanojoluxiladerako.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/88342592436.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130737250a19---71219207256.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/lovavojoditoza.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/35416705408.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/32644674617.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/94277513963.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/3153764005.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/66858272833.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/bupotudabugiwumaji.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/74942524344.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/keselefagos.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/86452591926.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906012638920586.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135054cc3d4b---bimonum.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/jozot.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/xizovuwujagazobudasazaru.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/93300903478.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/zumapitez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+backup+sms+from+android+phonePDF 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_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 11248 bytes
SHA-256: de7259c289bdaff837a7a295aed8e5f0d3bc780ec88cb758af4ec28e1b771c77
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 17620 bytes
SHA-256: 4deaa8694a2d0c1458135305f0f80dd5e9ceae9df18f5df9c791c6e0d9846878

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