Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dc26960312a6b9…

MALICIOUS

PDF

40.5 KB Created: 2020-11-09 10:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e3044f12975c4c3a3d8bb7fb216c7abc SHA-1: bf180672c8669f4c9d97ea16aba6ae9e092ca834 SHA-256: 86dc26960312a6b9d0e74099a609199419ee0efd9e942d2a345deb1e52a41341
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary links points to `https://traffnew.ru/123?keyword=stand+up+hand+up+pair+up+kagan`, which is likely part of a link farm or SEO manipulation scheme. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact payload or purpose beyond link distribution.

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://traffnew.ru/123?keyword=stand+up+hand+up+pair+up+kagan PDF link annotation
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/zisobujudud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_5f9b0f9e18e6f.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/bapamap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fa7d0106b6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f9651f3577dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f97975e1341d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_5f990cd3ac05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f89ab0ed3f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f94840d7a524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f8a543c3b14f.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/wixew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejados/betifaminavuzenafoxupipof.pdfIn PDF document text
    • https://rewuvitosil180903676.files.wordpress.com/2020/11/xegabaripupofirebinolizug.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_off00005f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F37 5176 bytes
SHA-256: 51680a9659fefc69005149f4eaac18a67003765f01e17c45eacecc05ccaaadfc
font_01_sfnt_off000070d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D0 10824 bytes
SHA-256: dd6c8544920b8b50823e4e1e0d0dfde50954b0c7b05b8ccb771ca1fffeaba237

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