Malicious PDF — malware analysis report

Static analysis result for SHA-256 24af5cb39638305f…

MALICIOUS

PDF

76.1 KB Created: 2021-02-13 15:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 924f395475586dde83793395add03b4a SHA-1: f8f693368fc1d62b8d7a502233fb6ea0f4724232 SHA-256: 24af5cb39638305fd1ec27541d886d108480f6d516000aff2f7a0b3a00c191b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

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://druttle.ru/123?utm_term=reef+tank+salinity+tester PDF link annotation
    • https://sutivekawexebe.weebly.com/uploads/1/3/1/6/131636655/4004a3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387718/normal_600539a9c64b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_601eff13b9eb5.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/p5uuNie/99890923806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fcf3c2b6fa91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_6024162485b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459780/normal_601dea21e5765.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/MhieheQ/can_you_stream_nbc_sports_network.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/bgihjvj/zodomofiri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493905/normal_5fe2dfbd444a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_600ce7f6df1e7.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jjihbTX/badlands_bbq_near_me.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/sinamozagemoger/asco_guidelines_irae.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/40938141651.pdfIn PDF document text
    • http://baverasoge.epizy.com/25352976453.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_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 4932 bytes
SHA-256: 8a045badfb39175045abc4054fafab3ababb40af7cceb834fea6c6c84f1cf88e
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 10748 bytes
SHA-256: dc5cd318839cf26bc69956857d140cf39ef7f5420785ecd871810c3aa88e0cc5