Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4bfd1802c23ce4…

MALICIOUS

PDF

53.8 KB Created: 2020-11-08 11:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b71e393dd9b134e71daf6a206787eb3e SHA-1: df9be4d7bacb084be5aa62688e018dd94f185e28 SHA-256: bf4bfd1802c23ce42b4fc986fdb03dc3df4c5dff7d65d6a9a7759fb7ce4b4047
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://trafffe.ru/aws?keyword=super+shred+diet+week+2+menu+plan+pdf PDF link annotation
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/f49fafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5fa1f44513c1f.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/niwoboke-kowemilinad-fuwumumamixe-fubebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f99cf34e0434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8723a498ce8.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/bffdd49c-929d-48cf-816a-4e6d39b6c29e/ciclo_de_refrigeracin_termodinamica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ce002b-a557-4f75-803b-492835d5f119/32118043645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad20d3b1-a9e0-4cb6-9e84-feed1021dd93/katesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e975d4b-fb67-4237-91e8-679d1a3443a6/13214908792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0874cb0a-015d-4fe8-a48c-ff46edc7de3a/fozokebopux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a99631-b72c-4985-9a0a-b87d9b11e623/cuerpo_sano_mente_sana_capitulo_7_cultura_answers.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_off00009485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9485 5672 bytes
SHA-256: 49dc0c975eb9718c562b455860f1c10d4023059f9d7643e37cf27cf068069797
font_01_sfnt_off0000a7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BA 10340 bytes
SHA-256: 692c59dc9c3c50d5cdd59837c293f5bb1f80805924d543925d13dca7479b122a