Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28b6b4c6cab0669…

MALICIOUS

PDF

41.7 KB Created: 2020-11-06 12:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4abda82208d92feb1a48cdbac566b158 SHA-1: d999da71032074091b9da83d1e62aca34405f956 SHA-256: d28b6b4c6cab066921a2a8d06a3a6352b729502a8745333561d48d61db789863
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://traffnew.ru/strik?keyword=spongebob+vacuum+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f872c3d0b4bd.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/8755772.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/8941713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fa49a8c29e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f963596c5cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f88fd161cdb7.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/e28e9ee8-a6c5-46a4-a9de-99f941735229/92078968146.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/88526951044.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/28077635699.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/17589916704.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/tuna_salad_with_egg_no_mayo.pdfIn PDF document text
    • https://s3.amazonaws.com/virumutipalis/mossyrock_high_school_phone_number.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_off000064b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 5248 bytes
SHA-256: dc5783240e946a9e4a8dbe0e20b75a70086cd618769f2086235b50c2e9c817f8
font_01_sfnt_off00007695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 10348 bytes
SHA-256: 527af9f1046e074ca59fb083345e485fd9cc2b5a9bdb69c5d3ce71ae7d84165c