Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c1d44f19fffce7…

MALICIOUS

PDF

66.0 KB Created: 2020-11-17 19:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9b806bf709ec330d888432a947376d3 SHA-1: 44bb949b6924c934f271e5f1a0c8ee768d4c3b46 SHA-256: f4c1d44f19fffce769f0cfe95205c98eb56aa0064731ad9179b3dfe111df73c6
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 0.9998

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://traffking.ru/strik?utm_term=certificacion+negativa+del+crim PDF link annotation
    • https://seforurusux.weebly.com/uploads/1/3/4/1/134131879/9901677.pdfIn PDF document text
    • https://waxojokizubow.weebly.com/uploads/1/3/4/4/134482073/4ffae5d6.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/4f00f6fc-f515-405a-b7ad-93fdc2e01ec5/definition_of_development_studies_pd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2332f0b8-6731-4a16-9718-781c4a7c0d25/zazimalapajozag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f3a4a5-d472-4b7c-b37a-e40d129fb3ea/autobuska_stanica_beograd_informacije_telefon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51dfe1d-4739-4e2a-8514-2ae3e734e037/dajejegunemawadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d5939f-7e65-43e7-b83c-98c34eda976b/87718957490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e181e4a-a870-4a6d-b1d6-0afc948ba039/nifalakisubarogibabekono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a86b1c8-04d6-418a-9f98-a92a4d73a0dc/ximabaditolapololi.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/92148776428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dade24bb-3241-48f8-b942-6653e233f389/halloweentown_full_movie_free_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6907f5b5-37d1-46ae-a9bb-9a9a4d3d690b/56159471589.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_off0000c3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E6 5128 bytes
SHA-256: 205e42b0c17786cdec802d2807119c10f7bfd352ae691dd5db32f0b95cd26f71
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 11180 bytes
SHA-256: 3e782a054ad05d38bdc75cb2094a3df58754e520e9d43f9057da10fe23aa2120