Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dbe6a8c4caa13b…

MALICIOUS

PDF

90.8 KB Created: 2021-09-16 16:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16f077f38d19a359b62fcdb7edea9465 SHA-1: a66a5aa56ec1e52eff9ef38553a5cc77286d4840 SHA-256: 74dbe6a8c4caa13b36a7cdd7d986f3298ed2f0dde4b941302466f3548efb97ec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://www.alugutader.fr/ckfinder/userfiles/files/75174683657.pdf In PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091318324990.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/34595367815.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/28933869334.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109091352108509.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/zejutotonitafotarukeboda.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613362cea8d19---pilotenevokedepu.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/lewerovefoxanelubo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gogipokifivuwoguxok.pdfIn PDF document text
    • http://kleiberit.ru/files/file/72646205979.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/60535616861.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/99191705851.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/fevewida.pdfIn PDF document text
    • http://osayit.com/images/file/zulekewewisirunatuzido.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/14648690396.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210916_0FFF9790704D1C90.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/46136040995.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/letavisojujofilesi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140140669dcc---gedula.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/gurojapuwal.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/38627607249.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/gedofilelebuselobelimu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zoxomuwozanakarupasesivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=final+fantasy+for+androidPDF 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_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 10308 bytes
SHA-256: 098ff0cebc14b3425a1472b191f1e645d73716bfdc3f295280c92c4990f70f1b
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 19132 bytes
SHA-256: 43acf230ba9f79eb7bd89e2957515582a4db080393fc178be58712554c181caf
font_02_sfnt_off00014580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.