Malicious PDF — malware analysis report

Static analysis result for SHA-256 9333389e09d18efd…

MALICIOUS

PDF

61.3 KB Created: 2020-11-19 08:26:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d78834590112059a57bdfdc1bb6a8858 SHA-1: 92ee01bbacafe6298368e801611a9f982af57403 SHA-256: 9333389e09d18efdd3a6f8f1f0b2712d1778121909b7ca334d615c1617d90cbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=pathoma+textbook+pdf PDF link annotation
    • https://xukopalobupekon.weebly.com/uploads/1/3/4/7/134730613/lejimazo.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/cafd84665a2f48.pdfIn PDF document text
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/4388946.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/sejukenibamu-zemerisifuj.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/fojesaletabonuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_5fa35f8b485b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f915ac72066e.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/tevurepizenebur.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/4562868.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/cb80a247-956a-4959-8b4f-1930fd18c9c5/pifozavonefatewomato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec957784-9498-4953-8694-8e64ba0d3a1c/23218963790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7caf8f8-5432-43f3-bdaf-21105db9cacf/bopugubas.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_off0000b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 5248 bytes
SHA-256: aa19260517a6ef63a83b7fa9de1c1a5d12d2112380bda724cec87b32f1c5eda9
font_01_sfnt_off0000c635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC635 10324 bytes
SHA-256: 2bb169b18163896cdd6976b104629be18ce7d95734d3f1d779b794a5187a9d1e

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