Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa3fcce9cf8b5f1…

MALICIOUS

PDF

77.2 KB Created: 2021-02-27 21:35:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0af48ae25ab2d78f78ad367e3b3828e6 SHA-1: 001fded7d7f60673dd84b17a63f89ca336893fa3 SHA-256: bfa3fcce9cf8b5f16cd0251cee72ab5ab710ab98fa7fc3de0b7a0cd993c8f0a5
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links, likely for SEO manipulation or to redirect users to malicious sites. One such external URI, 'https://vilenefex.ru/aws?utm_term=john+deere+850+tractor+parts+diagram', is present. The document body, though heavily obfuscated, contains references to 'John deere 850 tractor parts diagram' and 'wkhtmltopdf', suggesting a lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/aws?utm_term=john+deere+850+tractor+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450340/normal_601b7ce245e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5fd991ac86b6c.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/fifajesoga-wefemuje-vuzitufeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_600d496bdafbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_601723e80c2d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_603a267d5ad02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503787/normal_600906da6d5e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601ae4e834acb.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/gavapozalilup/lejafotutazanixelem.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/carnforth_high_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/modinegegib.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/2788589908.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/decretum_sheet_music.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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5904 bytes
SHA-256: 477712531a5bf4f15a79da27941db22bd1195f3369e7fcd32c625247a914ea6b
font_01_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 11144 bytes
SHA-256: 1036404d3cb0083270267d59fafa2069d4412fe0a9f6e7d8f026060386cabc29

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