Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd285ba5ae0edd8b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 06:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3ae28ddc964302823939fd10975a8e5 SHA-1: 8bb51c25aa73d3376ef83d5d7cce3558e946c7ac SHA-256: dd285ba5ae0edd8b3a8777b4d87a8ab36ce35327d3b9eb37147e11f7bd3a93a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://phanvienphianam.com/uploads/userfiles/file/bizulo.pdf In PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/kepezagagugex.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab9694cf6---mawugazororuwi.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/94860230688.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/95327858629.pdfIn PDF document text
    • https://dhesient.com/media/92641474370.pdfIn PDF document text
    • http://kohaz.hu/files/file/zepivinupifitudixolukedun.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/zisepugepaji.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9745e47cc---tiwosozerubejipofagip.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/rudiwetagegib.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/vasufolokajuxer.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/69458822325.pdfIn PDF document text
    • https://wilde-signs.com/media/24847992037.pdfIn PDF document text
    • http://didula.ru/img/file/kerusomebagugevepixe.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210926_065657.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/wubemafabowazikezodol.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/87049429530.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/kerikiritona.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/46038682984.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefosumofonepovo.pdfIn PDF document text
    • http://askaudit.ru/price/94220487365.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/nadifamoguxovalalutom.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/12917295797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=you+were+born+rich+free+downloadPDF 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_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 10616 bytes
SHA-256: cc23ba6a5681fd7357ae4784cd72e5559dfb0ef7637d080e114e764846daa679
font_02_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 15912 bytes
SHA-256: 9ed5b8d5641e5f289aeb9e02c93565d15f2f0861570ec1da4d21413a44075f25

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