Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0deb63a116d3e0c…

MALICIOUS

PDF

34.3 KB Created: 2020-06-05 04:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 385ee7061270ff5d66bf4dabb9d61a62 SHA-1: 5cbad7669bab9564f23e466c4a135805557841ec SHA-256: f0deb63a116d3e0c3bae78027d4a3ce4f8b74d030dbb5f72c3233d672694fcd5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by an ML classifier with high confidence as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to manipulate search engine results or distribute content from numerous domains. The primary purpose appears to be link distribution rather than direct payload delivery within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://exoticparrots.com/uploads/1/3/0/5/130539115/130539115.html#declutter+checklist+pdf
    • http://hostmaster.zendadue.com/uploads/1/3/0/5/130545985/xiwuruwek_fedefebimopaseb_jomopiriveg.pdf
    • http://mail.leeandpoon.com/uploads/1/3/1/1/131163904/cc9092.pdf
    • http://websitebymark.com/uploads/1/3/0/5/130541846/lowevumiwewesuxejap.pdf
    • http://a1255775xstreamtravel.xsideas.com/uploads/1/3/1/6/131636843/9197733.pdf
    • http://test2.basaltlibrary.org/uploads/1/3/0/9/130969893/919b7a56846.pdf
    • http://rangelandresourcegroup.com/uploads/1/3/0/7/130740558/lijek.pdf
    • http://equinebodywork.org/uploads/1/3/1/4/131405951/b83ca1962c71c33.pdf
    • http://exoticparrots.com/uploads/1/3/0/5/130539115/terms.html
    • http://exoticparrots.com/uploads/1/3/0/5/130539115/dmca.html
    • http://exoticparrots.com/uploads/1/3/0/5/130539115/policy.html
    • https://lagupok392153502.files.wordpress.com/2020/06/11349715037.pdf
    • https://sibexexuj.files.wordpress.com/2020/06/gofutesovawefuxidaji.pdf
    • https://tefivebofoge.files.wordpress.com/2020/06/24668287587.pdf
    • https://fusimutu.files.wordpress.com/2020/06/68484036652.pdf
    • https://kesakede.files.wordpress.com/2020/06/retenoxopejifiziwa.pdf
    • https://patepekugi.files.wordpress.com/2020/06/dokekewudaxidiritewuriv.pdf
    • https://pixapivuba.files.wordpress.com/2020/06/74631332442.pdf
    • https://pemorezi.files.wordpress.com/2020/06/12178052881.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d81.bin
0d9d0f54589631a380fbbc4d6beef8226aab749cbfd1fa5e57288abf2429a264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 9516 bytes

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