Malicious PDF — malware analysis report

Static analysis result for SHA-256 845d3b70b209332b…

MALICIOUS

PDF

36.4 KB Authoring application: Nitro PDF
MD5: a659b30f00cff8e31c0a96236c7c93bf SHA-1: fd8623d79735c06baf4c688068d16beb45713db7 SHA-256: 845d3b70b209332bbe6450a7c7bf0dda2c6f6ef8dbc231e35d88ede601991ff8
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, suggesting a phishing or malware distribution attempt. The ML_NYX_PDF_MALICIOUS and ClamAV detections further confirm its malicious nature. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

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://therapydoglovers.org/uploads/1/3/0/2/130270775/bonuxugirubijof.pdf
    • http://emilylimes.com/uploads/1/3/0/5/130590656/pavidivubiz.pdf
    • http://mupal.lechenienarkomanii-stavropol.ru/uploads/2020/01/28/lobafevinopesezepep.pdf
    • http://nicholasciolino.com/uploads/1/3/0/6/130604681/521393.pdf
    • http://uniquelysatarus.com/uploads/1/3/0/6/130604180/7eaec099e0f9.pdf
    • http://mindfulmerchandise.org/uploads/1/3/0/2/130287482/lupidoralejugotixe.pdf
    • http://landuseandwater.net/uploads/1/3/0/4/130483191/kikugor.pdf
    • http://djsacademy.com/uploads/1/3/0/5/130590400/130590400.html#organic+chemistry+vollhardt+7th+edition+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001367.bin
08046e701cbddd58b6528d442822bacccf04b22a0a8ef45847f8e46555f90bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1367 8636 bytes

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