Malicious PDF — malware analysis report

Static analysis result for SHA-256 81148d66a8bb9551…

MALICIOUS

PDF

48.4 KB Created: 2020-11-07 10:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7b3d654554738a692b6a9b10e363fb3 SHA-1: 354d54ed6c26b56491065d5aaab6d7311dadce3c SHA-256: 81148d66a8bb9551cc59ddc94a702425baaaeddf248867d40335448af93a0f40
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary links points to 'https://traffset.ru/aws?keyword=carter+250cc+dune+buggy', suggesting a potential SEO spam or content distribution scheme. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/aws?keyword=carter+250cc+dune+buggy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f9b06a4c71ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f98877022c0c.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/xosekilig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_5f9e3be9b8090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f9f17ffe9ba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a313f3-dccb-4151-b717-72dbb4b36c10/48014237527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3a288b-fdb4-4c29-86a4-9411c3fa64da/mosusemikal.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/jeluzabetewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d70ab98-e816-4f47-9a51-878431bc0974/85717248729.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/87516978970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cda9a9-aa07-42f7-afea-83e810d2adf9/43024310691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1433ffe5-bdab-4f8a-9ce7-ab70134ac355/10290011348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5058b406-1c96-4bc3-a553-e7f1e855d47f/tuvemuzotokonapirutuva.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://scripts.sil.org/OFLIn 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_off00006876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6876 5440 bytes
SHA-256: 1ef16e76e006cee576c3dc871aff552a6a2837aeb7d9ca766cc3cd19e77f9e1d
font_01_sfnt_off00007b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 10568 bytes
SHA-256: 6a6c6ea81076d0face1d5d05e10dce86f16a7658409255b89f0dd3e47e979c9a
font_02_sfnt_off00009f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F31 16140 bytes
SHA-256: 00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107

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