Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75b568c9118d545…

MALICIOUS

PDF

71.2 KB Created: 2021-02-28 01:22:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e717f74522ad14f502a21982cdf66a36 SHA-1: 7171daf22f072916caa3e458791a50cfd9a128ab SHA-256: c75b568c9118d5451bf4028d65818152e4f55f008907512ebb480f2ee0721bc5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a potential phishing lure related to a crossword puzzle answer key. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of numerous links to disposable domains suggests a link farm used for distributing malicious content or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=plate+tectonics+crossword+puzzle+answer+key+1-10 PDF link annotation
    • http://cadenalia.com/custom_aquarium_fish_tank_stand856yr.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/xxjcTja/39724653088.pdfIn PDF document text
    • http://valupimabo.22web.org/fivenagana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6003dc115fcae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_6000425bf0f45.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/iVibjb1/lanemod.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/ihbngh1/zamixikerani.pdfIn PDF document text
    • http://kmikaerfs.ru/5537989068250t3e.pdfIn PDF document text
    • http://carluxepaint.site/65475953388qyaqh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5fcee35ccd2cb.pdfIn PDF document text
    • http://tasuzafu.22web.org/glynn_county_inmate_population_report.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/dtggg3O/fabatitunatotaletoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakezemafatelo.epizy.com/3716802351.pdfIn PDF document text
    • http://furenenivigaz.rf.gd/baltimore_city_zip_code_map.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/dedilanobumimekozev.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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 5604 bytes
SHA-256: 2163785d9d0f0d4fdd072b9adcf42b3fcb64f0fe28606e1dd2b3bff2fee7dcf6
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10104 bytes
SHA-256: 0f676e78a2b95e7c6a10c6c8c18cb391506c9a1ab44f9cb11d8dddff723f32ed

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