Malicious PDF — malware analysis report

Static analysis result for SHA-256 889431463b8bfc85…

MALICIOUS

PDF

13.4 KB Created: 2020-03-19 03:47:57 +00:00 Authoring application: mPDF 5.7
MD5: 6780c9ac18a3813620e12a10a7fd5e45 SHA-1: d84a7bf7568ee290576bcf617342c3d5700ed1b6 SHA-256: 889431463b8bfc85320deb65dfb1682338c17a5801c743c9bf8b43f1333b549b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9102

Heuristics 2

  • 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.
  • 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 http://kitasdyu.myhome.cx/3870872876878877/The-Charm-School-Calhoun-Chronicles-1-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/3879879873875877/The-Horsemaster-s-Daughter-Calhoun-Chronicles-2-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/2878875878876878/Fireside-Lakeshore-Chronicles-5-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1871877878874/Fireside-Lakeshore-Chronicles-5-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1878872874875874/The-Winter-Lodge-Lakeshore-Chronicles-2-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1875877870/Starlight-on-Willow-Lake-Lakeshore-Chronicles-11-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/3874874872879872/Summer-at-Willow-Lake-The-Lakeshore-Chronicles-1-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1871878871875/Lakeshore-Christmas-Lakeshore-Chronicles-6-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1872871870874/Table-for-Five-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/2871871872874878/The-Lightkeeper-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1872871878877/The-Ocean-Between-Us-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1872872871870/Summer-by-the-Sea-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/2871877871872874/The-You-I-Never-Knew-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/4879873870873870/The-Lily-and-the-Leopard-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/3875877877874872/Lakeside-Cottage-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/2871870876877873/Home-Before-Dark-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/3872870878879873/The-Apple-Orchard-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/9870875878876871/Der-Geschmack-von-wildem-Honig-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/1872878872877/At-the-King-s-Command-Tudor-Rose-1-by-Susan-Wiggs.pdf
    • http://kitasdyu.myhome.cx/4875878879878873/The-Charm-School-by-Nelson-DeMille.pdf

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