Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54787398308afe2…

MALICIOUS

PDF

46.8 KB Created: 2020-04-11 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a4281e170951d07ee4cd49ca2995a20c SHA-1: 37d4a978616b4d194a115fa6f2f7cdc757259078 SHA-256: a54787398308afe2ed1c669dfb0cb0141dd3f09623d8955d64aa0c3fe7f0791e
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the distribution of numerous external links, suggesting a link farm or a method to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://socalspecialtycoating.com/uploads/1/3/0/4/130477890/130477890.html#diccionario+en+castellano+sinonimos
    • http://mvnatmed.com/uploads/1/3/1/1/131163505/rezegopufufawetote.pdf
    • http://hairbydwoo.com/uploads/1/3/0/4/130478975/gotavoloj_foguvil_wejad.pdf
    • http://kofferkino.de/uploads/1/3/0/3/130323100/7097204.pdf
    • http://next-level-impression.com/uploads/1/3/0/4/130476844/bakisogul.pdf
    • http://siberianpurrbabies.com/uploads/1/3/0/7/130776065/likoloda_geripofedeku_zemaw.pdf
    • http://replenishmysoul.com/uploads/1/3/0/5/130543598/b88f27580d.pdf
    • http://cpr-trainingclasses.net/uploads/1/3/0/5/130542692/2139820.pdf
    • http://deannasgro.ca/uploads/1/3/0/7/130740078/3011670.pdf
    • http://originalhandcraft.com/uploads/1/3/0/5/130539871/5a0b6d37.pdf
    • http://hairbydwoo.com/uploads/1/3/0/4/130478975/gotavoloj_foguvi
    • 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_off0000699a.bin
06948adf5a3e05363a3559413723c09f763153b530171b501d5d58be4730b6cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 10716 bytes
font_01_sfnt_off00008e36.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E36 2652 bytes
font_02_sfnt_off0000979f.bin
d66ec6bda34a5f069bb653e568c1f15db73d6429105816389650c77074cc6d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979F 16104 bytes

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