Malicious PDF — malware analysis report

Static analysis result for SHA-256 90965d81c1f4d422…

MALICIOUS

PDF

48.0 KB Authoring application: PDFBox
MD5: a870791512f85fb3c4d7f900b552233e SHA-1: 11dbf2322e06b689369e0f1401174c6eb8d3772b SHA-256: 90965d81c1f4d422c79922e13c659127acabb9c87f9cee47eaa5ff58a0c8aae8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to other PDF files, a technique commonly used for SEO poisoning or to distribute further malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the 'PDF_SEO_LINK_FARM' heuristic strongly indicate a phishing or traffic redirection scheme. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://hcanalesrojas.com/uploads/1/3/0/6/130620150/4318084.pdf
    • http://saturnsthoughts.com/uploads/1/3/0/6/130621313/xilukaso.pdf
    • http://midtownatlantachiropractor.net/uploads/1/3/0/5/130550801/xototukezugik-folaparofaz.pdf
    • http://arcadiagardensllclandscapinganddesign.com/uploads/1/3/0/6/130621460/130621460.html#les+messagers+des+vents+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010d0.bin
ebe506501a8d05538af5aa55bb80aea4fa26033872147ff235342e35c8ec445e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0 10888 bytes
font_01_sfnt_off000075f6.bin
0f23141ba94d37b49c53016ac63a9b008a6ac8e4c4656a8d80e6725f77750189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F6 16140 bytes

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