Malicious PDF — malware analysis report

Static analysis result for SHA-256 685eb1f2b53d1acd…

MALICIOUS

PDF

37.3 KB Authoring application: Karbon
MD5: 951487f4080a470d413e1a30dd8da509 SHA-1: 31c5a6c87c5e68f22a4ea676a5cd341ab791ba11 SHA-256: 685eb1f2b53d1acd448a49844cde0618bf8d54454f2bd87a1915d8478773eb95
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to host malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cticsemi.com/uploads/1/3/0/3/130379380/mevovuzerorid.pdf
    • http://pianomethod.info/uploads/1/3/0/4/130483830/1564648.pdf
    • http://shredpics.com/uploads/1/3/0/6/130620669/didotela.pdf
    • http://youdirtydawgpdx.com/uploads/1/3/0/2/130288359/pilobuporur_danisubi_jorivekeramavux_fajekomip.pdf
    • http://radioarcana.org/uploads/1/3/0/6/130620662/denebaw_bidizatamek_kiludedumurir.pdf
    • http://suejardin.studio/uploads/1/3/0/5/130589085/225205.pdf
    • http://befirelight.co/uploads/1/3/0/6/130621193/8459619.pdf
    • http://sanclementerwf.org/uploads/1/3/0/6/130620701/6761056.pdf
    • http://constructoraliverpool.com/uploads/1/3/0/2/130288557/6236243.pdf
    • http://drpatty.net/uploads/1/3/0/5/130590374/130590374.html#bowling+nice+formule+anniversaire

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000143a.bin
4f15b78245e354bd7755b620cf028276c90a07495b6642c00e54e887d1aba685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143A 10432 bytes

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