Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fe476651bef9d6…

MALICIOUS

PDF

38.4 KB Created: 2020-03-18 14:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9cf5dfae254f49aa16b5de9703bfede0 SHA-1: 0671ea836f106aa4545b79429fda9b3e864c00dd SHA-256: 38fe476651bef9d6a731b5e363ce7ce7ef370ea28e351ec9294a4e2525559c4c
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://succeed2serve.org/uploads/1/3/0/5/130590564/130590564.html#concepto+de+factorizacion+por+agrupacion
    • http://msjacksonsclass.com/uploads/1/3/0/4/130436180/vevolefegugu-vukumizunuj.pdf
    • http://newnextsf.com/uploads/1/3/0/5/130588596/pafalosukepopolobima.pdf
    • http://canarsieeventspace.com/uploads/1/3/0/7/130776687/4376829.pdf
    • http://ecoaquaconference.org/uploads/1/3/0/7/130740033/nubed.pdf
    • http://insitesafety.com/uploads/1/3/0/4/130483118/julomivakonagepijaw.pdf
    • http://hostmaster.camberwellwalkies.com/uploads/1/3/0/5/130588395/1b266d.pdf
    • http://everydaycamo.us/uploads/1/3/0/6/130621390/2638875.pdf
    • http://kblawncaresolutions.com/uploads/1/3/0/2/130288458/fca19d7815d.pdf
    • http://readymum.com/uploads/1/3/0/4/130483983/nenagofonumes.pdf
    • http://cookstown.ca/uploads/1/3/0/3/130313075/tanamumilelebi.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_off00006ae8.bin
2f0d26c2e7cab8770699429250f8eed11e46ad38367718832fe5456b26d3cf3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE8 8880 bytes

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