Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e96d9b289bf7b86…

MALICIOUS

PDF

66.0 KB Created: 2020-11-16 19:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 409e31c2fa7f47dc3b495eadc47d1d32 SHA-1: 9094a5c13f5905feff4a42da2e056a6f3890c75e SHA-256: 5e96d9b289bf7b86c251997f9113e2be245fce3c726ff2d09cbed139ceed9a9c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9995

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 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://trafffe.ru/123?utm_term=cheap+v8+cars PDF link annotation
    • https://kudigebudubug.weebly.com/uploads/1/3/4/3/134353201/ee27d71d96.pdfIn PDF document text
    • https://basalulonow.weebly.com/uploads/1/3/4/6/134612360/3ae843a559dbcc.pdfIn PDF document text
    • https://takotifisusa.weebly.com/uploads/1/3/4/4/134499816/foxixoposovituw-tuzusedidefudoj.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/jomitawobojewen_fuvugugifuju_nejuwuvisi.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/jamagitojenegewav.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/pabinidupigukaw.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/wenobagupexekap/muretawafatumiwifufij.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/invention_guide_dark_cloud_2.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/che_guevara_history_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/74472835195.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_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 5148 bytes
SHA-256: 279fe481d558ace7810accb6c0704cf34caf375b6ec8c8faeac842fededfd08f
font_01_sfnt_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10568 bytes
SHA-256: 20e9421fa1737aefcac821e219ad845f02d3294fc8b54eebf96e606ca419c90c