Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a7bd20e2198505…

MALICIOUS

PDF

51.3 KB Created: 2020-04-09 11:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9e0a0452b37647a00aed41f866aab2e1 SHA-1: fd01ed320c94d06a9a141a3e5e522340bb9342e5 SHA-256: 80a7bd20e21985059e24fc6ce66858154abb5110b43729804902a14ec0d0806e
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though partially corrupted, suggests a lure related to 'Tesis upn contabilidad'. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm, suggesting this PDF is a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://akronjoeys.org/uploads/1/3/0/5/130550706/130550706.html#tesis+upn+contabilidad
    • http://bestvehiclesforsale.com/uploads/1/3/0/3/130324324/mibexegudetuto.pdf
    • http://adu4us.com/uploads/1/3/0/5/130543050/wujopurewabij_luvuliwi_bobibolixe_fobure.pdf
    • http://clientacq.com/uploads/1/3/0/9/130969671/fokewapijegoweduz.pdf
    • http://canopalma.org/uploads/1/3/0/6/130604658/047e9917ae3.pdf
    • http://dietlicious.net/uploads/1/3/0/4/130476034/mivadubal.pdf
    • http://louromartinsadvogados.pt/uploads/1/3/1/3/131380485/25b09591322e89d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c97.bin
547738e878302de1b55768506ec709d8430f4039b4523802a4f1f642c5b36275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C97 8844 bytes
font_01_sfnt_off00009ca0.bin
6c8203cc433f3c43ff2dfa1252dfda58061aa43394712e2f2bef77a18bf374e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA0 2420 bytes
font_02_sfnt_off0000a764.bin
fcfb3bb3734280c83b7e8f40476e4be14383df497b026725fc58954651f710b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA764 16648 bytes

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