Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5152c0e85051e71…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 09:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f866426a8bbc65bb26fa598177aec0ec SHA-1: c749c46cd041e359933d996a528ad710e9946a6a SHA-256: e5152c0e85051e71b941a932e0142ed8d40e8a09ec98d4d06d3f3a73a96fa6c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' heuristic, which is a common technique for executing malicious actions within documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The numerous extracted URLs, many pointing to PDF files on various domains, suggest a link farm or redirection mechanism designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://bawauang.com/contents/files/34943198038.pdf In PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/16711656837.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/96350789021.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/wexusexagovixemafujoz.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/jemafusaxun.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/48965218137.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/29854012606.pdfIn PDF document text
    • https://resicolor.com/upload/files/6240202291.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/88367658931.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/vunika.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/pudedoxek.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/48478215480.pdfIn PDF document text
    • https://e-room.co/userfiles/file/72820805525.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/96035670793.pdfIn PDF document text
    • http://hkalc.com/userfiles/xopiwimomobamalor.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/11493692516.pdfIn PDF document text
    • https://italvaping.com/file/semixizidevimalim.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xojoxopisekizajida.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zajibokef.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/96407169697.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/juburirok.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1573aa10---23146296425.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a52ddc12e052fb6337917f3ebd3f7ce2/82654945489.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/80196541467.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/40810254136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=plus+one+physics+textPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10528 bytes
SHA-256: 74c4d56006bc230862e948fcccd245a82009dcd49b6d7ac8256e81af5fe3e9ce
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 17164 bytes
SHA-256: df4e1affca1a39c37996d09b2beab90f95797976fcdb00f21e44468b51a2f637