Malicious PDF — malware analysis report

Static analysis result for SHA-256 f338ef38f973453c…

MALICIOUS

PDF

35.2 KB Created: 2020-11-09 02:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d64d8386c6b32de2068196eb1ecbf0e7 SHA-1: 0348c3494c543d6462685c7abc3fb07484e61cf9 SHA-256: f338ef38f973453c845125146a41d9d0179d73ce5f2a2fd989bfa5020697254a
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://trafficel.ru/123?keyword=panorama+elementary+ia, is directly associated with the document's content. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. While no scripts were explicitly extracted, the nature of the link farm suggests the document is designed to redirect users to potentially malicious sites, possibly for SEO spam or further payload delivery.

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://trafficel.ru/123?keyword=panorama+elementary+ia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8bfe4ed22e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5f98d9bc6f898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fa3d11a167f5.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/bubisifapagefe/think_through_math.com.pdfIn PDF document text
    • https://kakutojuzi.files.wordpress.com/2020/11/grade_6_math_translations_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/algoritmos_50_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/21329493189.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/i2c_vs_spi_vs_uart.pdfIn PDF document text
    • https://nadekeg.files.wordpress.com/2020/11/80101704547.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/finding_distance_on_a_number_line_worksheet.pdfIn PDF document text
    • https://xaxojisepi.files.wordpress.com/2020/11/94870274191.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_off00004978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4978 4756 bytes
SHA-256: 9eac5ed199f470f9cfc6a6c44e3ffee641e984a2c955713e210550c06f462bed
font_01_sfnt_off00005991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5991 10944 bytes
SHA-256: 4fffaa0ed56172be690719388625439c45dd95d82c3e265f5a4836559d27af9c

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