Malicious PDF — malware analysis report

Static analysis result for SHA-256 3959bbd1f85fbc2b…

MALICIOUS

PDF

39.6 KB Created: 2020-11-06 09:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e7bdac9e9cff30a02b815069667fddcd SHA-1: b4f92e1b6f0788350db28fa6cf44f7fc17b6808f SHA-256: 3959bbd1f85fbc2b0209095d665a31eba6efa2fff4c5f4d17c0de0a928d905d1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, suggesting a link farm or redirection strategy. Crucially, it includes a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for downloading and executing secondary payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://trafftec.ru/aws?keyword=packet+tracer+7.4.1.2+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f9d346e2b151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_5fa0162334491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f95286872842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8c8586a4516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5fa40f31dea74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8fb323d6151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f9fd29f3553f.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/c59e3b83.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/vibuvomomuv/kevikototovusokup.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/wodawadudopoxebab.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_off00005b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5F 5300 bytes
SHA-256: 8717d9a6d52957ab1f9f4b4fbd9e4fd63eba0fff1f984a9ab21f162ce99bae34
font_01_sfnt_off00006da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA6 10224 bytes
SHA-256: b07a7c7a41fe6b93d54fe7f470615a6ca738d624bc010286ad1d38db535c3c57