Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ddd6423f31d2b0…

MALICIOUS

PDF

79.5 KB Created: 2020-11-23 02:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39bf070161640c101db10f42f3c0b117 SHA-1: dd5ad621ba37107c912bed209e06d920cd82c367 SHA-256: 20ddd6423f31d2b0ba87c39eb5e7a3060e368f9acd00a81dc31423e492444d12
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://trafffi.ru/123?utm_term=gta+v+heist+crew+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408582/normal_5fa2a96d34c3f.pdfIn PDF document text
    • https://fovavizudaz.weebly.com/uploads/1/3/4/3/134375550/nibepusiwas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_5fb9e9ea46e55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5fa2fde25e887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5f91ec85b9dad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_5fb809aebf8f8.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/5820017.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/dc102ab0b703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8819ba81325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_5f9834a1029c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f9b3a05baa91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f90b93ca63b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f9105a666048.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/lawab.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/332a1e17-78d3-44ba-b141-7bf464056eac/51986271457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776033fd-ff91-4aa8-a624-9a53719ec423/64737535323.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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 5352 bytes
SHA-256: 03e42af88d6dab377714f51864a5fae5949aeb1c934c01183b687a7de4c358c0
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 10980 bytes
SHA-256: c36fa3bca950ead6e1dc5e1987de398102a1120a383af78d63dc88e0ba1f1b6d

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