Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6044b3ae93dc20…

MALICIOUS

PDF

66.7 KB Created: 2020-11-20 00:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3772a686537f82d63b224e8bcead1b86 SHA-1: 69d00c264d12ac8b8be21abbaf96ce56769e95b4 SHA-256: ef6044b3ae93dc201cda9060e7f2e05ee880df2b2dd5dc229824d79f3bab8110
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=kenny+chesney+don%2527t+blink+album PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f8ff561d62af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f870394c33cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f9e43032d05a.pdfIn PDF document text
    • https://guwewekotijiz.weebly.com/uploads/1/3/4/7/134714515/6733165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_5fa898172d040.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/09906093-af8f-46b0-b9d0-1e96a3fa5bde/ciel_association_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26f6c0c-594e-4925-b711-e506bc55d43d/misonukubinoxelalat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fc01e7-57c5-44b5-b11b-615f1683aae8/1926199593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bceab08-e020-4224-b0e1-cb342d389fe9/38425215231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bae63e-f37c-4970-863a-30171858327c/napitenikux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53513b0-0f4c-4f88-955a-0548a65d7657/soratimunaborotex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa5f66a-0a62-41eb-aefb-ca4c63f8c1a4/jinuk.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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 5392 bytes
SHA-256: 35c95b859e7298caeb25fbe7cb9da0eaa0368cdeed4f412c1d86a52092dee0b3
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 11028 bytes
SHA-256: dd513fd032b1be661ac80d378789d7b9709195011b3fdb78f034f5cb54826b62

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