Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6743932e31c07b0…

MALICIOUS

PDF

94.0 KB Authoring application: pdf-parser
MD5: 05b1bf6d464b11c71c0b9a7317c5398b SHA-1: 0556eb275ffee7562e96575eb191b7563851f0d7 SHA-256: b6743932e31c07b01d56ca780101c26d852f9f06f9187065c18fd9ebbece5100
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic specifically identified a large number of external links, with the first being http://bujotuk.audiostart41.icu/uploads/2020/01/28/3506003.pdf. This suggests the document's primary purpose is to act as a lure, redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bujotuk.audiostart41.icu/uploads/2020/01/28/3506003.pdf
    • http://msoath.com/uploads/1/3/0/5/130589251/tepufuguxejokum-vikeponowi.pdf
    • http://comecleandetail.com/uploads/1/3/0/4/130478374/cbee37e.pdf
    • http://nicosnerdnews.de/uploads/1/3/0/3/130312952/b13585529779e.pdf
    • http://vesopit.ru/uploads/2020/01/27/divesu.pdf
    • http://projecthomestead.us/uploads/1/3/0/2/130288318/ratodute.pdf
    • http://gregdrews.com/uploads/1/3/0/4/130493476/23010ca84328c12.pdf
    • http://michaelshusko.com/uploads/1/3/0/6/130621854/130621854.html#on+systematically+distorted+communication+pdf

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012fb.bin
b512ae609cad9382064734a5bf328b249a4a9ba8cf5b134910deca2f21f8e2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB 11448 bytes
font_01_sfnt_off00012141.bin
8b2e30aec9d5c30e75d2d3f56334641c47cb94105e9e8940f3f3debbcb2ccc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 16868 bytes
font_02_sfnt_off000138a2.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 2652 bytes

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