Malicious PDF — malware analysis report

Static analysis result for SHA-256 8043a6432bc684eb…

MALICIOUS

PDF

36.6 KB Created: 2020-03-20 06:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ae65efc6e13c0db7c8f5a1e1c6c9ff07 SHA-1: 979c1d3ccb3128fce1dcce4cf030ac5761cb3e13 SHA-256: 8043a6432bc684eb6b3f258ef9666bf19024d4d43ff82202a81738e3b15d3ae3
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body contains a Spanish phrase related to the definition of law, which may be a lure. No scripts were extracted from this sample.

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://bigdsuperfoods.com/uploads/1/3/0/8/130874317/130874317.html#cuales+son+las+acepciones+de+la+palabra+derecho
    • http://summercourt.biz/uploads/1/3/0/6/130621164/2375631.pdf
    • http://ndcca2016.com/uploads/1/3/0/4/130435842/tozivixosemo.pdf
    • http://endlessarttattoostudio.com/uploads/1/3/0/6/130621648/78ec5c5e080e.pdf
    • http://ngreenco2.com/uploads/1/3/0/7/130739037/dudexan_pasexomawijasi.pdf
    • http://ishsh.org/uploads/1/3/0/5/130551226/fomin.pdf
    • http://m28baze.com/uploads/1/3/0/3/130379391/4769669.pdf
    • http://lorenkeithjordan.com/uploads/1/3/0/5/130550890/jonimifusarekiruwa.pdf
    • http://sunsetmedicalcare.net/uploads/1/3/0/2/130270931/nivajigolel_xalibesaju.pdf
    • http://merveillessucrees.com/uploads/1/3/0/6/130620185/9791f62a689b2.pdf
    • http://www.otcusedautoparts.com/uploads/1/3/0/4/130488123/juvuwafifulezob.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_off00006636.bin
70e96ef91d6777088b8c7fe2062a8b5497e28baa64e13b18177e67c44766fb07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 8464 bytes

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