Malicious PDF — malware analysis report

Static analysis result for SHA-256 811121378a9d2fa9…

MALICIOUS

PDF

39.3 KB Created: 2020-11-08 08:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0b0d5bdc7838b23e5a55656ec25f391e SHA-1: 26d51bd0cf71f88b945d6a74a94cf7fa3f2c21aa SHA-256: 811121378a9d2fa9e403cac66a842ce625a7d198929e810799dd20303453e85f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://traffset.ru/123?keyword=head+bumps+on+scalp, is directly embedded in the document body. This suggests the document is designed to redirect users to a network of sites, potentially for SEO manipulation or to host further malicious content. No scripts were extracted, but the structure and embedded URLs strongly indicate a malicious intent.

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/123?keyword=head+bumps+on+scalp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412607/normal_5f93aefe325f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f890df554eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5fa689b78550e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f9fb24d0ab1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f87524b1d707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_5f98123a32fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f88f76e934bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/96209371822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300c3d02-86f4-4043-8142-c6bba29b0040/the_girls_guide_to_absolutely_everything.pdfIn PDF document text
    • https://pefatukumon.files.wordpress.com/2020/11/23222944606.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/84186355978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e30638-490d-4913-a229-67d69be12a6a/65343273777.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D46 5224 bytes
SHA-256: 33295d96bd8e29b7ce30d871c5df2e50ef16a7a383dd579f477578c0fc2d4c59
font_01_sfnt_off00006eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EED 9996 bytes
SHA-256: 0e125e1e2cdd4c93705393228da97b158f34f88c2f83a70614247ba6d6d7f86e