Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcf779e025b9ca2…

MALICIOUS

PDF

79.3 KB Created: 2020-11-08 01:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 82be2d53d8b51cd32895dad80d4bfba8 SHA-1: 9d60b39cd802475fa67de94587d848aa927e84fc SHA-256: 3dcf779e025b9ca2f62311b375dc7cb55b92a5b7cd7a7f655534f1792fb3afa4
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://trafffi.ru/aws?keyword=weekly+math+review+q1+3+answer+key+for+monday PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5f9d85201bf7c.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/fibesezati/libro_prohibido_enamorarse_de_adam_walker.pdfIn PDF document text
    • https://fulupepaxut.files.wordpress.com/2020/11/printable_editable_birthday_invitations_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/tracker_2015_santa_catarina.pdfIn PDF document text
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/25462388158.pdfIn PDF document text
    • https://wikilebe.files.wordpress.com/2020/11/rikapuforiko.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/etiology_of_stroke.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/astm_e8_e8m-_09.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/65323525170.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://damilum.files.wordpress.com/2020/11/fotozigirevukekes.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_off0000f8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D9 5820 bytes
SHA-256: 029f67b93bb2ee0854d71cde881cd2dbe3684bb3c8514cb37752e809c2d47a20
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 10424 bytes
SHA-256: 3bee85486596907a1837e026bf98ad522383a7d4ba567d51535ca4fc71ef071b