Malicious PDF — malware analysis report

Static analysis result for SHA-256 07115ee5a5abd6e2…

MALICIOUS

PDF

48.2 KB Created: 2020-03-25 14:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f66fecd8b1de5cbcc177901744ab771f SHA-1: 165997ed527e8025899f48bdf5a2b91064ec3542 SHA-256: 07115ee5a5abd6e2f334ed659def36784d3b4286ec33bf925086d339ba02f7b5
96 Risk Score

Malware Insights

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

The PDF contains a mass of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host or link to numerous other documents. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to direct traffic elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://keatingphysicaltherapy.net/uploads/1/3/0/7/130739633/130739633.html#tabla+de+calibres+de+conductores+electricos+segun+el+amperaje
    • http://stopgappropertymanagement.com/uploads/1/3/0/6/130639899/lixedeto-jagoxopefutivi-jugaf.pdf
    • http://skills4nz.com/uploads/1/3/0/7/130776886/527317891a6f058.pdf
    • http://www.corybuffaloe.com/uploads/1/3/0/4/130489725/tinagudavizirowuj.pdf
    • http://klinmasterservices.org/uploads/1/3/0/4/130435862/12272.pdf
    • http://jameselliottlynch.com/uploads/1/3/0/4/130476616/6921103.pdf
    • http://haniayiska.com/uploads/1/3/0/4/130435791/gojajejoni.pdf
    • http://sheepadoodle.org/uploads/1/3/1/0/131070888/tedux-vozesokukobez.pdf
    • http://ylrart.com/uploads/1/3/1/0/131070187/6ecae4a256e.pdf
    • http://deericophotography.com/uploads/1/3/0/2/130272369/fonumubuwafumaw.pdf
    • http://mrmrsroachnationalambassadors.com/uploads/1/3/0/7/130775653/dudafibuvujudi.pdf
    • http://janovelo.com/uploads/1/3/0/5/130588286/3252.pdf
    • http://eagerbeaverxtoyz.com/uploads/1/3/0/6/130605074/bb9ba.pdf
    • http://jacquegraham.net/uploads/1/3/0/7/130775639/4fc57f2a.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_off0000795d.bin
e4526c0a968d52244a8469e08555bf8fed1349ae568520edd41fda254180fb01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795D 9336 bytes
font_01_sfnt_off00009b13.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B13 16312 bytes

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