Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb5537ec65f8890…

MALICIOUS

PDF

69.0 KB Created: 2020-11-10 07:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 595539476c283f9b1f1cedefbfd9ee26 SHA-1: 98e2da29b1fb2cf4108886d67a5a6bbadc8065c4 SHA-256: 5cb5537ec65f8890ee3a3f2f4ece27367986f3674c4cb06db5e3e198c67fa556
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://traffking.ru/123?keyword=monster+legends+android+hack+no+verification PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f9ee10f7effe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386334/normal_5f936cea5ac19.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/kabivok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5f907517b1ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_5fa7ab24d7551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fa2b9f285844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fa8cbdd9d731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_5fa9c402d176d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f872b2d9afff.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/pisimogateku.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/6053529.pdfIn PDF document text
    • https://bizilekiri.weebly.com/uploads/1/3/4/6/134647150/5144883.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/1e7ed852-2be8-4824-8fbe-761d1328cff6/10078909531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563e679b-dd3b-47a7-8cea-712ddab0cb01/2660693727.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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 5412 bytes
SHA-256: 13ecf6ee5deb7490f92d008c1d8bcb3c106ea8cf783a99908ceca0e6ffbda5d7
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 9576 bytes
SHA-256: 32783314fc4b02fd0e37360576f47aca4f154afcc3ced4560e48c996a05e3132

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