Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d2fc9f9a614e36…

MALICIOUS

PDF

143.0 KB Created: 2020-11-17 01:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b210ddfa80b61534ab9ace79d8930fe0 SHA-1: d86451ad1afcc90a43bc783d64d63eeb5c9950ef SHA-256: 87d2fc9f9a614e3634a13c845127e22d36db43f9cb288002bb1576a338b0dd0d
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-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://traffnew.ru/123?utm_term=amish+porch+swings+kentucky PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5fa8dd9b13f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f92fe3c1be28.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/1031011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_5fa56e0fa6d2f.pdfIn PDF document text
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/xilotodejisetupep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5fb2fefebaeaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f8eea66ddb96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8731aa72d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5f9b3181e0ac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_5f9d6373eb249.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/6575944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5fae4a2d7d8c5.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/bceb8f30-bfd7-4e3a-8a84-aeb7862003ae/vecinos_capitulos_completos_online.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_off0001f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1E4 5352 bytes
SHA-256: 0ddcc358aeb3a05c822e7655a81b4036b16b48d237a0c690af475f9622b8cb28
font_01_sfnt_off0002040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2040E 12740 bytes
SHA-256: 01217bea1f0236b0497044ba17b92dee85b8f7dc6b71df1c5dad9fc4d055c651

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