Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ec49da7d0f1c4…

MALICIOUS

PDF

44.3 KB Created: 2020-11-06 07:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 110f870eea82ca2cb8f1371b81220e8e SHA-1: 22e72eee21e0a566e04da25f71296b156dda4275 SHA-256: 787ec49da7d0f1c40c10ce903bdf960b9cd832b9834753466c0b967053c79a66
96 Risk Score

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 1.0000

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://trafftec.ru/123?keyword=color+by+number+games+free+for+kids PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f99ec43ae448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f8a7bd7b6153.pdfIn PDF document text
    • https://poxusesemeli.weebly.com/uploads/1/3/4/4/134462398/pesomejepamu-nuvisexas-vimaxenibuzewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f87c0628025b.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_5fa4a2708e8b7.pdfIn PDF document text
    • https://repumuwijuruto.weebly.com/uploads/1/3/4/4/134469056/f56a3bc54434320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_5f9f9876e3326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5f9b1de3c2a18.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/memul/blank_music_sheet_a4.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/unblocked_games_66_minecraft_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/48599979225.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/tuguputebus.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/bezefonixijonoxid.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/odd_composite_numbers_1-100.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_off00006e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6C 5440 bytes
SHA-256: 7c77f332a8832325062e8b4f86612e5aba6db52a16e134115fd6e119d40c58c4
font_01_sfnt_off000080d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80D9 10504 bytes
SHA-256: 5760fa7f3f40bb5419b8392a015979c6c4a9b81505afa43756c14bb541075f27