Malicious PDF — malware analysis report

Static analysis result for SHA-256 642742a4531a5841…

MALICIOUS

PDF

47.9 KB Authoring application: Adobe PDF Library 9.0
MD5: 442068b0ebb114bd4eed6b07be29ed56 SHA-1: b95876424726982461bd679bc436499eca0e3dc1 SHA-256: 642742a4531a5841eda4ac4f6b418659cd146f9876da1d942af083262a137ec7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, which is indicative of a phishing or malware distribution attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics further confirm the malicious nature of the file. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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://btaccountingandtax.com/uploads/1/3/0/6/130620579/8212005.pdf
    • http://diegobarrenechea.art/uploads/1/3/0/6/130605435/169dd958b3.pdf
    • http://xupab.cityglush9.icu/uploads/2020/01/29/bonivusu-vanadunogexasej-mimidagotugap.pdf
    • https://xuwulujawod.weebly.com/uploads/1/3/0/3/130379597/mipijagopog-jobajutexiluras.pdf
    • https://tilajarijawem.weebly.com/uploads/1/3/0/5/130588702/2103463.pdf
    • http://portal.createweb24.com/uploads/1/3/0/6/130604004/130604004.html#schematic+diagram+of+activated+sludge+process

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010fc.bin
105d909d4792e1a61169c40c99d884bf68d8a3043ad3312d3649a1d31198803f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC 8404 bytes

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