Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a3f0bb98eb59ea…

MALICIOUS

PDF

60.4 KB Created: 2020-11-06 09:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ac8c265293d88f3e1383d463c8f877dd SHA-1: df71a0706d961458242f2807fbc275332c0b7906 SHA-256: 40a3f0bb98eb59ea22458221d186020b63569e5e3ac27a7c8e306bcc337749a2
96 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 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 0.9999

Heuristics 4

  • 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/strik?keyword=genasi+fire+5e PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5fa2b743a0b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f91d463beb08.pdfIn PDF document text
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/madasurebadug.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/pagogilibarij_duzilifad_rejewepupew_nosenodikigib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_5f93d5b336e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f87aeb882ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f8a31ca86490.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/69e8ba3d-e4ba-42a1-a42a-edeba0884134/used_goose_decoy.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/love_monster_worksheets.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_off0000aea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA1 4884 bytes
SHA-256: c7eb556d24e114ca4c0acbf43c4514a7aa49f7b04a9e28d8e48109f154095bb6
font_01_sfnt_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 11136 bytes
SHA-256: b4ec07f5f768f08728f6f567fade936ab6e21f89c55d0d2fb20c38cf5e48eef3

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