Malicious PDF — malware analysis report

Static analysis result for SHA-256 857d73f174111dda…

MALICIOUS

PDF

50.3 KB Authoring application: Nitro PDF
MD5: a1319b08707f9963e6dba180892319c7 SHA-1: fcde8b3dc6b17c6ced8e31f401f5d8de85106c77 SHA-256: 857d73f174111ddaf63e6d62adbf021592dbb4598de1ebdd075c5adaf4b8249e
150 Risk Score

Malware Insights

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

The PDF file contains a link farm heuristic, indicating it's designed to host and link to numerous other malicious PDFs. The document body, while partially corrupted, mentions 'Civilization 6 guide' to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and potentially a robot installer. The embedded URLs are the primary indicators of compromise, likely serving as download locations for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wizzi.ru:80/uploads/2020/01/29/62abe82e.pdf
    • http://digitalsystemresearch.com/uploads/1/3/0/5/130541574/fixapuxedam.pdf
    • https://viditoza.weebly.com/uploads/1/3/0/2/130272569/talovazino_rapaden_lamon.pdf
    • https://vabinazuwanino.weebly.com/uploads/1/3/0/4/130436125/tolig_wojatud_vixomukuj_sonanopaj.pdf
    • http://dianapoems.com/uploads/1/3/0/7/130739745/130739745.html#civilization+6+guide+strat%C3%A9gique

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010e6.bin
c5aa756addca0aac3d5aeba573fc89a62fc7bed0147c9b16c49b5c0e091a61ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6 10284 bytes

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