Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9228b5ee8f4193…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 21:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 24e72df7162a4c1f7762fc6c4a7c60cc SHA-1: 2d891d938d8faab73b9b44351cd2e1a3600bc898 SHA-256: ba9228b5ee8f419386e4b26f18a8e770d74c813a26fbe5d65b8c6d6f68e94b1f
66 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 0.9997

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=hp+probook+4520s+datasheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390069/normal_6030236e2c8a2.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/minabo.pdfIn PDF document text
    • https://sewimoranekodov.weebly.com/uploads/1/3/0/9/130969375/vikoxogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365656/normal_5ff950123208c.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/rumevatepofel.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/gd2Jzjd/22510937086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_6015a45d41687.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/8298674.pdfIn PDF document text
    • http://maxist.ru/metric_to_awg_conversion_tableru7vd.pdfIn PDF document text
    • http://m-ryanaf.site/noches_de_pesadilla_antologia_de_cuentos_de_terror4brix.pdfIn PDF document text
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/gitew.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/jamazil-lagisuna-benizulajivuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5ff1d13981854.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/8ijjbvm/68210503156.pdfIn PDF document text
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/4796688.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/cibThjK/professional_photographer_cheap_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/dxhfehi/best_minecraft_java_adventure_maps.pdfIn PDF document text
    • http://nat-yoga.space/5621756752stnr0.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/mhjc8rQ/ninivopoju.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/voropa/fekigesojexogize.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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 5668 bytes
SHA-256: b242dee6d74317731515d2d69359103296d9bc792483041546c073459ca44124
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10548 bytes
SHA-256: d409a136cb0bbb40f15b577415b4d962d678aa3a351eff262cf963da12cde417