Malicious PDF — malware analysis report

Static analysis result for SHA-256 7072b32f3645be0a…

MALICIOUS

PDF

50.9 KB Created: 2020-04-11 02:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 92a71ab9d8858f53215c4e5abb45db97 SHA-1: 7dd690d67b0a7b874919c00d1dc3c228ac65a2af SHA-256: 7072b32f3645be0a7a670a6b2dbb27fd63ec18982b5aacee0cc32deb5eed79c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to create a link farm. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://74-123-77-223.mgwnet.com/uploads/1/3/1/6/131637125/131637125.html#successful+writing+at+work+11th+edition+kolin
    • http://bluemarbleexplorer.net/uploads/1/3/1/3/131379111/buvamej.pdf
    • http://peristorm.com/uploads/1/3/0/7/130738831/5620284.pdf
    • http://chialphapsiucla.org/uploads/1/3/1/4/131406502/marawaruxolejo_motosamefedotaf_lufeji_pejivelefi.pdf
    • http://shelbybaldock.com/uploads/1/3/0/5/130588976/8210338.pdf
    • http://menscentralinmatesearch.com/uploads/1/3/0/4/130476678/welozuj.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008afa.bin
5963e20b871070e9e63a2950feb95ca224fc8f9f46bb581e9963be6ac226ebca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFA 8028 bytes
font_01_sfnt_off0000aa02.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA02 16204 bytes

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