Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd3bec594331f93…

MALICIOUS

PDF

74.6 KB Created: 2020-11-12 20:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4aaae30a226297ec268e5990f999a7ab SHA-1: d798f4dc90b97f4db708387bb5c02a9e450834de SHA-256: 5fd3bec594331f93afd66b8ff1d9507134fbaa245999f9bf434548fac26ddd0e
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://trafficel.ru/strik?utm_term=une+cuill%25C3%25A8re+%25C3%25A0+caf%25C3%25A9+en+gramme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393363/normal_5f9f6ac6137fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f888c35254f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fad6271ddb74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f8f8538db409.pdfIn PDF document text
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/6414213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f8d8dcba7079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5fa10454cfa1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5f982d6de2d46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f8de9627c984.pdfIn PDF document text
    • https://folesatabija.weebly.com/uploads/1/3/4/4/134441350/vofutetokuf.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/cdb2ca8a-14af-4da7-b764-52db1139e6c5/kugisobatunapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2394dd-4816-4954-bb5d-3c985cd7fcf4/5817806397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ef6a94-41f2-4a01-9007-c2bb5e14c2c5/dubuxusapezadafopuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db88c6a7-a953-4e0f-a8b6-25ecc068e330/tetusid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c4f73d-6f36-4c90-b1dd-c39c4d3c2fd5/juxafugesekasinifujilo.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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 5532 bytes
SHA-256: ac169092f8c36ba515625328ca9180a88b9dd3db6fb259f782dec64230a123b4
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 16692 bytes
SHA-256: 0ac2ca33aa660c6426ebc1de68d484fe9066868092595d8c2532a4e83292ae23

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