Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e56226d83c22cf…

MALICIOUS

PDF

37.1 KB Created: 2020-06-13 01:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2523d12918ed850b120e5d71b9ddf0a9 SHA-1: c5794f507066415cfc209b2bdb7640eb81fc7c76 SHA-256: 38e56226d83c22cf77f5a4fcce1cd7fa8d422c6ace30eeaf1eb432a129f6e711
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains designed for SEO spam. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Proceso administrativo' and is likely a lure to direct users to these malicious websites. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

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://quanxunwangbeiyongwangzhi.br3h.com/uploads/1/3/1/3/131380977/131380977.html#proceso+administrativo+alfredo+cipriano+luna+gonz%25C3%25A1lez+pdf
    • http://thisthat.w33blyqa.com/uploads/1/3/1/6/131606955/555487.pdf
    • http://strategicviability.com/uploads/1/3/1/4/131438709/27b7063.pdf
    • http://pospaperhawaii.com/uploads/1/3/0/7/130776791/nupusejokatat.pdf
    • http://cpanel.delaneydrywall.com/uploads/1/3/0/2/130287997/0e460a2f.pdf
    • http://pokeplug.net/uploads/1/3/0/7/130739597/7e1b8.pdf
    • http://marinafreire.com/uploads/1/3/0/4/130488442/ruzilifesagobipawevu.pdf
    • http://admin.hwupenyuproject.org/uploads/1/3/0/6/130639784/paxapuselipegi.pdf
    • https://jewokiwisaze.files.wordpress.com/2020/06/85383465733.pdf
    • https://xoxijukixife.files.wordpress.com/2020/06/vipalajugoligaz.pdf
    • https://povodijagez.files.wordpress.com/2020/06/24682028016.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_off0000636a.bin
0657fe47025f0cc91cc594aa851c4e1f29540633bc768ee41716e54c14a25a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 10560 bytes

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