Malicious PDF — malware analysis report

Static analysis result for SHA-256 617fdac0294e9860…

MALICIOUS

PDF

73.4 KB Created: 2021-09-15 10:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38d79e0b3cb893e4e21fdef670bf3f78 SHA-1: f72ea7cf5fb3cbbe33b56898bcfe3d1345a21117 SHA-256: 617fdac0294e98600994cdadb2a72b7d28f3dcf59ac6bf4643c5090bd05aa930
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the embedded links. While no scripts were extracted, the structure suggests a lure to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ladna.pl/user_images/file/zetewexixezofuzamisele.pdf In PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/43587274654.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/71201788905.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gelimof.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/2343395258.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc45a825b8---96182625670.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/54001302461.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/terunudo.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/60518171217.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zajegogawunoro.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/bufivanena.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/mufiva.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/38319954544.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/tukumekezerozelut.pdfIn PDF document text
    • http://charontrade.hu/data/file/95860717769.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/61490029018.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/lijisegite.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/72985799459.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/33861220616.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/37569314960.pdfIn PDF document text
    • http://surestegc.org/documentos/file/bozufugorokeweziganorizum.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/18749583208.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/xexomezoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=raymond+murphy+essential+english+grammar+pdfPDF 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_off0000b815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 11204 bytes
SHA-256: f47193fae5a9c7833b77570bc0cba11f739f2e1610b2b52f3a18d0198e79d37e
font_01_sfnt_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 17640 bytes
SHA-256: 1791244066163f0fcf8a234e29923e6fd1dda6687ba0ad6c552182de25108899

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