Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a2bab366480d31…

MALICIOUS

PDF

42.4 KB Created: 2020-11-09 05:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6b9cfe40c3ae9d198e0a5a36890e35c0 SHA-1: 2803813471a48e054a7f6349379f14201c93325e SHA-256: 74a2bab366480d3141948afc17162dcbd9583b0f8e077b80602f92264762bebc
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/123?keyword=digiorno+pizza+how+long+to+cook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8762e55dc3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fa298e4dcf92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5f9018990308b.pdfIn PDF document text
    • https://gulatavinijigu.weebly.com/uploads/1/3/4/5/134507109/6f17c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_5f8f17532f5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_5fa46ba0dfd71.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/06f042dae57f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pozajifu.files.wordpress.com/2020/11/pdf_to_jpg_converter_freeware_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/safelite_auto_glass_iowa_city_iowa.pdfIn PDF document text
    • https://bofubifabe.files.wordpress.com/2020/11/archeage_fourth_twisted_gate_fragmen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A67 2968 bytes
SHA-256: 1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056
font_01_sfnt_off0000650d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650D 5224 bytes
SHA-256: 2fe2e1fee1a4c0751716b6de0f17b8ddf53625af277693d756d895d2a3678d0f
font_02_sfnt_off000076f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76F0 11116 bytes
SHA-256: 29bd44c48f4a6c2046c2bbfd0e7e5763d665e2bd89beca340b114e496c613348