Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3685d828650ed18…

MALICIOUS

PDF

42.9 KB Created: 2020-11-06 20:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 761d6627d5f52b9d683d33008fc52266 SHA-1: 9d0a3a3dda00caa0d4d5f5b4258bb95c4de3b3db SHA-256: f3685d828650ed181185795bd491018a43a4a46d46ed1d0985e33aa5e66aeb5a
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://traffset.ru/aws?keyword=skyrim+high+hrothgar+coc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5fa4efa565289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5f9cde928c678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5f915ae9911e1.pdfIn PDF document text
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/7033673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5f960ec062c55.pdfIn PDF document text
    • https://fozokixudaxo.weebly.com/uploads/1/3/4/3/134355354/b90e38a.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/a83ce040-a3f8-4ec4-bfaf-6241f896bc70/wumepepumetagepolovo.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/principles_of_helicopter_aerodynamics_j._gordon_leishman.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/printable_scantron_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0e2649-57e7-435f-b6be-7d04169f18f1/jutibipuvisuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af8e71f-40a8-466a-9afa-c7c68c6c4ab5/2018525426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bdfc9b-d393-46a8-8091-1e8ff1a93881/bikifunekimifud.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_off000068cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CB 5272 bytes
SHA-256: cfee34cc646e8ea580b1c4e62daa8e80d79034de7cb1baeecfd4e866e82dc216
font_01_sfnt_off00007a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9E 10868 bytes
SHA-256: f426d75aab7ae7c8abe628dca4ddd7960d0bea6b426199b5668fd4169cf19d93