Malicious PDF — malware analysis report

Static analysis result for SHA-256 671cc5728bc4517b…

MALICIOUS

PDF

32.1 KB Authoring application: PDFedit
MD5: 4b366bd7529152e3024e738639469fc3 SHA-1: 7929ffd0f6f78de570ce5d72d0e0f4e925cc1004 SHA-256: 671cc5728bc4517be438d77633c599c856f78fbbee73a54c5ccdce8ae1146860
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and ML classification further support its malicious nature. The embedded URLs suggest a phishing or redirection campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://personalnetworkappliance.net/uploads/1/3/0/4/130435771/zuxifogipalidoduk.pdf
    • http://sophiesticated-travelstories.com/uploads/1/3/0/3/130313458/5547505.pdf
    • http://ce-seniors.com/uploads/1/3/0/5/130551433/4448566.pdf
    • http://northwestuu.com/uploads/1/3/0/7/130739153/130739153.html#maastricht+consensus+report+helicobacter

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fab.bin
62166b6522c5f03760b0ade316c33ba30e3f6c208698e05f6cdd9eefc461f563		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB 7852 bytes

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