Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb404a1dd77aef73…

MALICIOUS

PDF

71.3 KB Created: 2020-03-26 12:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1cb84178190b92fdab4dbae9a5f6dd17 SHA-1: c4a9c7b1ec14c8fe40d569c43c72f1f19b6672bf SHA-256: eb404a1dd77aef7371a98386f8f2767ff0b50e35b712d6472372158828231b42
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is inferred from the PDF structure and the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sdsufiji.com/uploads/1/3/0/6/130605167/130605167.html#sintesis+de+colesterol+regulacion
    • http://pburg94rescue.org/uploads/1/3/0/4/130489437/4315309.pdf
    • http://zions-salons.com/uploads/1/3/0/4/130476523/dusazorinada.pdf
    • http://takebackcalifornia.org/uploads/1/3/0/8/130814921/firirejedabade.pdf
    • http://www.dialysismenuplanner.net/uploads/1/3/0/7/130738730/6c179185aab09ff.pdf
    • http://oakmont85south.com/uploads/1/3/0/6/130620877/306bd15f76eff13.pdf
    • http://pedersenmedicine.com/uploads/1/3/0/4/130488398/1384699.pdf
    • http://sselaw.com/uploads/1/3/0/2/130273803/6272810.pdf
    • http://dmacedoengenharia.com/uploads/1/3/0/5/130545194/nitafamuziduvu.pdf
    • http://kennyroyer.net/uploads/1/3/0/5/130588961/tesexe-rubenosusuvox.pdf
    • http://njfmanwithvan.co.uk/uploads/1/3/0/7/130776819/doxesanixesufu_pasonetuzed_felukumosop_tesux.pdf
    • http://www.whyonmyshoes.com/uploads/1/3/0/5/130551343/8170691.pdf
    • http://miperks.com/uploads/1/3/0/3/130379163/zigokome-temos-zawado-ronipudixawemi.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_off0000d95d.bin
54a91e966c2cf30286c91aac128f33693bb8a2508383657db1885b311a767b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10116 bytes
font_01_sfnt_off0000fd54.bin
a97699715e06f063ad03de64cc291082570f2ad5c34198ba14d32b2d3c0d4a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 4824 bytes

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