Malicious PDF — malware analysis report

Static analysis result for SHA-256 25350d324522601c…

MALICIOUS

PDF

59.8 KB Created: 2020-11-17 16:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c3f832af2a3c3070b328afab30f25da8 SHA-1: dbc9a71e9df22196b3fbe8d546efed406c20dfd7 SHA-256: 25350d324522601c6cf968d2cdd3ddbdbedd115305d2f0a1aeb9ce71838340a0
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 0.9996

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://traffine.ru/strik?utm_term=atls+10th+edition+post+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425009/normal_5fa68d08ee460.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/295a4b086e.pdfIn PDF document text
    • https://fepavibubezi.weebly.com/uploads/1/3/4/6/134611462/putoj.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/530815779a15ec1.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/fudume.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/1ad9d7c4-b367-443c-872a-68aba60c8aba/57798090180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cc9cce-4822-4bc9-947b-8f4dee46f504/sixisiwovixivemati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba97a74-ed7c-4458-88ac-327dee6b4fd4/92969629217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f8ff0a-2538-4a30-be56-dd5b86ac4d9a/pupafit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4f28b5-b955-421f-9e08-7ab0e3074004/76021163585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003eee8f-404d-4cc6-b5c7-8b1e2067e5df/venus_mcflytrap_cosplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551f6f23-4ce9-43af-8871-57e9a52c8155/32339423381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d788e761-b951-40ce-93c5-279819a5f409/32413865683.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_off0000ad3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 5324 bytes
SHA-256: 9b9fd578a90451a0d52a85f9a0d0132914cb80d43ddb4dd9ef58ff472fd2ef54
font_01_sfnt_off0000bf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5E 9840 bytes
SHA-256: bd49601cd58b05103165931e76a7e314d3ee5b71e08e4cdfb8bbc4bb15909b74

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