Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c680cdfc4b832c7…

MALICIOUS

PDF

39.7 KB Created: 2020-04-04 13:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 670f15f6a8a2828633431dbac33131a7 SHA-1: 05e07d2fba27d0f4a53a6a0bf0e9457d81d835cc SHA-256: 2c680cdfc4b832c72fe24273707511d5fcabdd4576a72f23ba7dd59a4f0ec9ca
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious sites. The document body mentions 'Circuitos con ic 555', which appears to be a lure to attract users to click on the embedded links. No scripts were extracted, and the primary malicious activity observed is the mass distribution of external links.

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://jlorch.com/uploads/1/3/0/6/130603928/130603928.html#circuitos+con+ic+555
    • http://bahamasbeachvacations.com/uploads/1/3/0/4/130488583/gidafux.pdf
    • http://vollaraltools.com/uploads/1/3/0/8/130874246/zaxademowu.pdf
    • http://tinnituscalgary.com/uploads/1/3/0/6/130621641/1d555cd0d1.pdf
    • http://paulyspalsdaycare.com/uploads/1/3/0/7/130739462/zivizomag.pdf
    • http://mjagworks.com/uploads/1/3/0/7/130775111/5317992.pdf
    • http://nhvfd18.org/uploads/1/3/1/0/131069923/nupeladiseda.pdf
    • http://kaslou.shop/uploads/1/3/0/5/130548108/679ddf171f77c.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_off000066de.bin
6d31c13ffd271a2352dbfc0c9fc96b9751b5353439cfa699461dfa5ab4e0c4cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DE 8884 bytes
font_01_sfnt_off000086ba.bin
d8435aac11388b8214bfc980e857510ef47481ba706565f25bd6cae8efb01319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BA 2828 bytes

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