Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf8c2bdb552b9c2…

MALICIOUS

PDF

41.4 KB Created: 2020-11-07 12:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 90c6a20b6dc9af427918c1d34acd2e1d SHA-1: 7fc30af6267afb15f65ff93b1e2d4ee7f14f6a59 SHA-256: 3bf8c2bdb552b9c224207503455a1cf468c06624faea896700ecd7aa76186d85
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a link farm, indicating a large number of external links. One prominent URL, 'https://trafficel.ru/123?keyword=network%252B+guide+to+networks+8th+edition+free', is embedded within the document body, suggesting a phishing or redirection attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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://trafficel.ru/123?keyword=network%252B+guide+to+networks+8th+edition+free PDF link annotation
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/gawoneguzajuzusunuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f875fe8e5ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f9359a65a4ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f8cc0386b1ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_5f9d3ae568ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5f9b63426927a.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/ponuvo-buxin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8e18d168fb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f8d7487c4a18.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/2513c48a-1d26-43e4-9888-635ca7fba063/lokalal.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/51850729219.pdfIn PDF document text
    • https://gitiwatubige.files.wordpress.com/2020/11/fuwejidemafikadepebame.pdfIn PDF document text
    • https://fevuxiwop.files.wordpress.com/2020/11/unable_to_accommodate_work_restrictions_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e758eedc-fe2d-46d0-bad7-a382c50f75ec/wugixozotikubowivowure.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_off00005801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5801 5244 bytes
SHA-256: 1dc3f7ee43db74f1986fd6255af885baabf6eff5472ea2546dded3a84bfdef23
font_01_sfnt_off000069f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F9 14084 bytes
SHA-256: d71a1f51c95fe4f53a75ce2d0c506122e4b62cedc0f9ef3e67aae05f1c33f1be

Open this report in the interactive analyzer, or submit your own file for analysis.