Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c700fa8a46d7b32…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 08:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00af14c0a7f87014c53696ab26dc8ef3 SHA-1: 241454208acde099237652f6828cefc22786a7e2 SHA-256: 7c700fa8a46d7b327f3c42ee01b9dab7693ffbf0f548c4d3d9bd7b65166d8675
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic identified a link farm structure. The document contains numerous embedded URLs pointing to various PDF files on different domains, suggesting a coordinated effort to redirect users. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://lnianemarzenie.pl/userfiles/file/46209574299.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/xigilirijarivo.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/zabozuvibaluraxudukixaroz.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/66907217160.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/90106915607.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/vibop.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/rokikabazir.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/fubotuderofezovaku.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631302171_1.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/66604027616.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/rujuzoraburojumedo.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/gevesexobebapik.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/67499580899.pdfIn PDF document text
    • http://secoinblock.com/upload/files/gamukitekuno.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/95926234138.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/94689362843.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/xajixejuzeruxeradi.pdfIn PDF document text
    • http://innotack.com/userfiles/file/71784011272.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/64654529456.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/5786707290.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/duvurebijuvusuxudajoluzuv.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614277c3eaa10---moxesarusujudur.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/gopobubudul.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/55372363585.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/jolodovapadanab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sunglasses+app+photo+editorPDF 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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10844 bytes
SHA-256: 1141e53ec5d169767bf2c0434fd0dbd4ddf3ecfc5b354ad77254bcaab0495c8f
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 19512 bytes
SHA-256: 2acd72fddda58599bb00a361a174a2d4832859d6a5e15117fc8d4ec1207d2cdf
font_02_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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