Malicious PDF — malware analysis report

Static analysis result for SHA-256 668565e6bb3fe074…

MALICIOUS

PDF

49.2 KB Authoring application: pdf-parser
MD5: 12ddde7da04bcb856703d8fbefd55c82 SHA-1: c8017b92c98583d4d5729800e20e3fdec5cb37a2 SHA-256: 668565e6bb3fe074d737d1871497fa88f52119e7bf34f35e62f6e1aa9a015b05
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of external PDF documents, disguised as a 4th-grade math assessment. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ClamAV detection 'Pdf.Dropper.Agent-7860868-0' confirms its malicious nature. The embedded URLs likely serve as a mechanism to download further malicious content.

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.
  • ClamAV: Pdf.Dropper.Agent-7860868-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7860868-0
  • 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://empathtoorder.com/uploads/1/3/0/4/130476322/2f7d65da7cca52b.pdf
    • http://rogainesines.weebly.com/uploads/1/3/0/6/130639746/didifozekufeko.pdf
    • http://warwickcarriagedriving.com/uploads/1/3/0/2/130270918/nuxuxalipar.pdf
    • http://josephdefeo.net/uploads/1/3/0/5/130539139/3154811.pdf
    • http://angelicharpacademy.com/uploads/1/3/0/8/130814933/5933086.pdf
    • http://momentumdanceandfit.com/uploads/1/3/0/7/130738902/d0624c9f75.pdf
    • http://kristiepottertherapy.com/uploads/1/3/0/5/130551144/130551144.html#4th+grade+end+of+year+math+assessment
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000115b.bin
b4f1b70de5e4efbde9197a74d6c9eefcb5d329770cd64622dacbee4d3bdb1e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B 8916 bytes
font_01_sfnt_off00008116.bin
9c439c213f0312605c6cac591cdddee6cda9b5d99bc83859e85da6866b8b511a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8116 4528 bytes

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