Malicious PDF — malware analysis report

Static analysis result for SHA-256 b848e265befc1b46…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 09:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea5a84020d7250e29665b7df8aa2f4ad SHA-1: 1a7ea485d9fe791a892646749c8dae6b10f6fe8f SHA-256: b848e265befc1b46c4cf25fe0c324e33e6e4a79ab1cc458d73db0d91f2d62b10
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting for PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to create a network of redirecting links. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://smidgel.ru/uplcv?utm_term=samsung+galaxy+backup+apps PDF link annotation
    • http://kasand.com/userfiles/97824523131.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/gizuniwis.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/99328456916.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/95978561699.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/zizax.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/69043056001.pdfIn PDF document text
    • http://air-con.ru/upload/files/limonetakenenifudib.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/5103616511.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/83828793092.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/35002947178.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dejunegozorifesipupoxutod.pdfIn PDF document text
    • http://baoveantam.info/upload/files/49360335712.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/79648741649.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/tukibawuzujeluje.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146ebff13f74---ripipukonala.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/levuw.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86f3adec6---6900581108.pdfIn PDF document text
    • http://vecsecity.info/editor_up/xiwukamixinado.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/xumirasa.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/43555848099.pdfIn PDF document text
    • 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_off0000b716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 16360 bytes
SHA-256: 93d257d1d37d6b8b5cfa977ad3d6bca602c121496b96951e8dff5b471995058d
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10800 bytes
SHA-256: 79b41385e6b073a7178521bb17b30ed6f65781e420fc445380f13038dce06002

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