Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1236c7fec4accc…

MALICIOUS

PDF

73.3 KB Created: 2020-11-20 11:37:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4e1fcedc9c8d72937b32d3b5c540675d SHA-1: 9b4e7dccd7077b83405b74498ac4654ac45057cb SHA-256: ef1236c7fec4accc08813217f29e643f63fc6376bb029ba8de6d7c7e45af627b
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 0.9998

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/strik?utm_term=child+play+3+full+movie+download+300mb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fa4076db1161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5f9ddf041b1f1.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/2866622.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/tapalisizemef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f87848d58210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f9dc051d7503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_5fb7049108b65.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/8047988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5f91c8d7b6976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8aec7ade09c.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/a1fd9b85-b2fa-42d6-9dfd-442b34d486ff/hellblade_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c1e973-4205-4754-9e0f-1828fb7d2e86/89723034439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed76ddd-9356-47d3-871b-f6dd2cc92a24/14410687686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdff040-4941-47c9-8de6-36797d468486/salesforce_crm_content.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca38add-c80c-4b48-9d1a-d1d35b8f49b3/funawagigorokoxaroku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adcc650f-cf9c-4134-9b83-bbe07861977e/como_obtener_el_peso_constante_de_un_crisol.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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 5612 bytes
SHA-256: 6fe737580b7040768e80a63894cc9814d853be98e5b456a6ab0115d5ea834845
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 10716 bytes
SHA-256: 0dbd5d310e166d211be067fed31907e1f537f936f21026be024f7fcd2cc9b959

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