Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2683388f8bd3bc…

MALICIOUS

PDF

46.9 KB Created: 2020-11-05 19:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ec06be038cb3ed8201c6231d06c3149 SHA-1: ddb48e7426f3c6448dc20858159007dd711ba551 SHA-256: 3d2683388f8bd3bcbdc091070f286aa40395392c12761f4a57c85723afbd0b4d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/123?keyword=car+sales+receipt+template+free PDF link annotation
    • https://nopuwilimo.weebly.com/uploads/1/3/4/4/134490360/513640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_5f9b7cc9725c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f95331c17d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5f97562f7b755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f89532b77b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_5f9b4103d0a97.pdfIn PDF document text
    • https://ledijomunekivi.weebly.com/uploads/1/3/4/5/134584754/wonomefopoxi_kobedun_garujazimiliza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f87532402655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5fa057d0e5400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f94c60d0d99f.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/litunux/pakifesa.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/nude_it_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ebf797-cecf-4fde-8a80-2d0f6bb2b55d/76549400984.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_off00007913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7913 5064 bytes
SHA-256: deddddbf4d75d2de1e3d4be4988a770edee872851512a26def1c20c386923608
font_01_sfnt_off00008a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A35 10664 bytes
SHA-256: 2bd66ad365727973a4d0ffe85b3cdc6952cea5a5f2caadf98109bbb65b4f9dbc