Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e23b1e3f5d85f8a…

MALICIOUS

PDF

38.0 KB Created: 2020-06-17 21:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d5abe16aceaf9a81b58fd90d94f1a2 SHA-1: c68029259657527689ea3160171ae17291edd0e9 SHA-256: 1e23b1e3f5d85f8a592d17247ab0328ec679646e420a7e6d5d661415ac86bac1
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or link farm attacks to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of many embedded URLs supports this. The document body, though heavily obfuscated, contains references to 'stem cell lesson' which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://greensleeve.store/uploads/1/3/0/5/130588419/130588419.html#stem+cell+lesson
    • http://chantillytaxisedan.com/uploads/1/3/0/6/130604621/totagusexawusaj.pdf
    • http://hostmaster.peniel.be/uploads/1/3/1/3/131398605/1a5da96c9.pdf
    • http://elpasodriveschool.com/uploads/1/3/0/4/130483825/3130d4d48e04.pdf
    • http://aabuildingmaintenance.com/uploads/1/3/1/4/131453252/sisage.pdf
    • http://ktmirisha.com/uploads/1/3/0/7/130775990/5372317.pdf
    • http://fitmortgage4u.com/uploads/1/3/0/5/130551089/b8911b49e633.pdf
    • http://dallaspremiermovers.com/uploads/1/3/0/4/130475959/xukomak.pdf
    • http://mail.eyezone.com.sg/uploads/1/3/0/6/130639386/ximetikuwefep-wekeguvojuzelob-dipedeza-nomivamodoki.pdf
    • http://onlinestoresebaycom.com/uploads/1/3/2/3/132302960/d3b9b05d4880.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a7d.bin
27d63422412bf37fafc9944562ea38252f781834dd4b649e531e4faf5706d239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7D 4480 bytes
font_01_sfnt_off00006996.bin
c65088e88824cc133ade68a81fa8fd20e2de0fcdf2795c07bcc42d79f95e9945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6996 10264 bytes

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