Malicious PDF — malware analysis report

Static analysis result for SHA-256 2021ed8175657767…

MALICIOUS

PDF

45.2 KB Authoring application: QPDF
MD5: d5719544c8368d2dce5011f7b9b4979f SHA-1: 6b35145703593ba1290b95b1978ff0bb91fc5005 SHA-256: 2021ed817565776736dcf196c75004f2754867f0cad3bb251cc54c2ed720e339
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted from this sample, but the extensive link farm suggests a delivery or redirection mechanism.

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://redwaters.co.uk/uploads/1/3/0/5/130542924/wivoxefitukixijeniw.pdf
    • http://pacxo.us/uploads/1/3/0/5/130588850/nobojerunebagefe.pdf
    • http://off2grandmashouse.com/uploads/1/3/0/6/130621640/jefotuxeli_lovazuwo_juzozedejif.pdf
    • http://amberbeuthien.com/uploads/1/3/0/3/130379146/558dee.pdf
    • http://criticaluniversitystudies.net/uploads/1/3/0/4/130435962/7811163.pdf
    • http://psychlitsummaries.com/uploads/1/3/0/6/130639910/e9020eb45813c.pdf
    • http://restorationlogcabins.com/uploads/1/3/0/6/130620828/504889.pdf
    • http://ardmorevetservices.com/uploads/1/3/0/4/130494801/kawugisimo.pdf
    • http://vidyavara.com/uploads/1/3/0/6/130639669/3e7c944353e46.pdf
    • http://27000grainsdecafe.ca/uploads/1/3/0/6/130604198/6998218.pdf
    • http://repentir.me/uploads/1/3/0/4/130483070/eca9480.pdf
    • http://nursingarmpillow.com/uploads/1/3/0/5/130590019/130590019.html#back+to+school+coloring+worksheets

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012ca.bin
8167d602bc964d27f936dd06238db86b81bfee518027e10d6351e5be8a1c6a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA 8380 bytes

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