Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14195f922519c3b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 19:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 564c9a89fdff256c6a19b8a3f3ba7154 SHA-1: 9c934bdb3f4144e726487d086f3f910ce93e32ed SHA-256: f14195f922519c3bb9bb6eeed780495a6bd4d6522101423d0cab89d2432bebae
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users. No scripts were extracted, but the overall pattern points to a malicious document designed to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=einstein+his+life+and+universe+book+pdf PDF link annotation
    • https://idealist.ro/userfiles/file/vonemasobotejem.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/tibunirubogilonezoverivu.pdfIn PDF document text
    • http://becucci.it/userfiles/files/80052664482.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/jimidax.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mowozavoj.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cfcf79f---12947268228.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/88126019149.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/39161270334.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/79866817000.pdfIn PDF document text
    • http://vln.nl/files/file/xefejevopaximegomamajiga.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/2529986798.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/putadixukozodixekej.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/93810936468.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109132322026462.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/genetijovexutezirexugex.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/datakototupe.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/nogerawef.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/bapifipawizes.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/75883499181.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/39721411024.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/81481936037.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/zeradebaxajegakawa.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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10976 bytes
SHA-256: 22d615d5d86e78f6a243b5678edf05ae530c54070aad827efd7ee2f9e9ae67db
font_02_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17756 bytes
SHA-256: 1c96a692edebb9f1940ad8f206e0cb2246561c6eb557bf16d04f7ebae521b030

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