Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbf3c2a68958f56…

MALICIOUS

PDF

82.6 KB Created: 2020-12-24 14:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 67977dc7d2abd133909cac994cb90308 SHA-1: c3671569e2a7f8f96da8c22c30823ac6c3f5f425 SHA-256: 4dbf3c2a68958f56a94c8a6d60f367c827c286157ce2c4432e4fcd84f4f3c4b0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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://trafftec.ru/strik?utm_term=best+three+point+shooters+in+the+nba+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5faa082ff0040.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ffVgihj/flights_to_las_vegas_from_houston.pdfIn PDF document text
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/cddab497b0052b.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/gjnfaai/nuluverowos.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/idoij1W/gifegidoliwilo.pdfIn PDF document text
    • https://pirowefe.weebly.com/uploads/1/3/4/4/134444143/7868271.pdfIn PDF document text
    • https://kutubugovu.weebly.com/uploads/1/3/4/5/134581815/jikexuwito.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/bjix6ja/hamster_cages_made_out_of_wood.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/dEBhayr/microsoft_translator_languages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/accf4cce-8c24-48b2-92a1-53aebf6a40e4/subordinating_conjunctions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd18cc61-f9c0-407f-bb06-69b9598e57f4/97007794498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b082372-7847-4df1-92a6-c51687d16e2e/convert_75ml_to_fl_oz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e054beee-22b1-4749-8da9-7d0be85efdf5/mid_manhattan_library.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_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 5308 bytes
SHA-256: 80526c1539595ef7869953f736f194614a602ff80b6126ea814293ed9f6c1394
font_01_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 10416 bytes
SHA-256: f9c98378995a1ba0da5a1c340084a5ba6775a514767b7a93f4f82afe7749f2e8

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