Malicious PDF — malware analysis report

Static analysis result for SHA-256 691761f68f59661b…

MALICIOUS

PDF

36.5 KB Authoring application: Solid Converter PDF
MD5: 7d7095542277bc99d2b9757ba3bec685 SHA-1: 95fe32ae5f03848a2ad769eef400cd4893281489 SHA-256: 691761f68f59661b1cc2116c7c10d65a72be903f78028dbe990d1521139b73f7
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links. The embedded URLs are likely used to redirect users to malicious content or for SEO spamming purposes. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as phishing-related.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pulkovo3.info/uploads/2020/01/29/medevoneduxubuwirobe.pdf
    • http://moderncountrydoctor.ca/uploads/1/3/0/2/130289722/mukufozid.pdf
    • http://camelcottage.com/uploads/1/3/0/2/130289246/a59128f.pdf
    • http://aeem.com.au/uploads/1/3/0/6/130621032/5fd5107e20a8a7.pdf
    • http://ajandlindsey.com/uploads/1/3/0/6/130603832/mamuwunagovam.pdf
    • http://nerdbabies.com/uploads/1/3/0/4/130476332/603588.pdf
    • http://pinballwizard.org/uploads/1/3/0/4/130477335/5776185.pdf
    • http://bodyworkbybarb.com/uploads/1/3/0/2/130289198/130289198.html#cbre+singapore+research+report

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010ee.bin
d0573564131f286b19c5a7359845b67c382ca0b9f207f74cda8622725845c4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE 8408 bytes

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