Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6d6e2007f8461c…

MALICIOUS

PDF

65.7 KB Created: 2020-11-11 08:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e7fc5e547300de3d6e7a6685d96f06bc SHA-1: dc8c852d5d2ad1d820a383374f1c1dcb95768d73 SHA-256: de6d6e2007f8461cc37063c1a3ff7c5ecc09b4c4f67c3d50e509d3cbf05b8351
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://traffine.ru/123?keyword=find+the+missing+length+indicated+geometry PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489601/normal_5fab3868dd9ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_5f9f402b12c5f.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/mokewizuvenakikibon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5f944a96be6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8de9895f734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fa4f90d5624b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_5fa4415714042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f924641c0a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8b82c10ae59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5fa0268e60162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5f9638cc45421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5fa4d4872a771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/bimetofimiwek.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/38929152113.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_off0000c58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58D 5412 bytes
SHA-256: 7cac07c2df3105ca060300c8bcdffd5897dce76d0b79c99e419ba4af26457e8a
font_01_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 9960 bytes
SHA-256: f925b7cf22e10c1c3fae750852d76e24c4268886096497e7ac6d88ab9c1bafed

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