Malicious PDF — malware analysis report

Static analysis result for SHA-256 867da8d015cafbc1…

MALICIOUS

PDF

82.4 KB Created: 2020-11-08 14:13:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 531511809b21dadb4b97c8b1b15ec88e SHA-1: 83af4d1a5c71beefcb56a98833a264f6e8db174e SHA-256: 867da8d015cafbc16a23f97ea74330ef854f92c72d10743b764bea1409eada40
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, https://traffset.ru/123?keyword=artificial+intelligence+with+python+ppt, is presented as a document title, indicating a lure to a malicious website. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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=artificial+intelligence+with+python+ppt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390660/normal_5f8f46a2e1158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8a798b193e1.pdfIn PDF document text
    • https://najutumivuzobo.weebly.com/uploads/1/3/4/4/134473994/4779428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5f8cbe6aa03da.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/9603088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5f985b57c2d55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mukut/viniwuzevatirewuwitefofaf.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/28952480418.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/standard_bolt_sizes_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/4430046254.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/python_programming_book.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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 5072 bytes
SHA-256: 54e0ba4fdf2b42df650bcbfb3eb8ddee1ea1f09c385f03faab5186242ade546f
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 11776 bytes
SHA-256: 3a663abb0c5dd16d123915afe5bdc421cd58ae0335baf43ba57931570800b255
font_02_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3