Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c4959af6425e52…

MALICIOUS

PDF

39.1 KB Authoring application: Serif PagePlus
MD5: 377a625b36e017daeb663d0c744a5959 SHA-1: 828b81041ba925da844164eab872dbc12b66a535 SHA-256: b5c4959af6425e52a9cc513fca07ca7f99474be07c4262196286f6abd2bdab44
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The PDF_SEO_LINK_FARM heuristic specifically identified a link farm containing multiple external PDF URLs, indicating a phishing or redirection attempt. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content.

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://mentesconscientes.org/uploads/1/3/0/6/130604415/4897076.pdf
    • https://wezujodajatid.weebly.com/uploads/1/3/0/4/130436307/nutexidasorefaxetubu.pdf
    • http://bitcoinserv.co.uk/uploads/1/3/0/6/130621741/mukuvawixik.pdf
    • http://mhsclassof1976.com/uploads/1/3/0/4/130491001/sazemezojaxawo_rogemuno_rufokimilinup.pdf
    • http://heartst.art/uploads/1/3/0/6/130622104/lotofevada.pdf
    • http://xavim.gurmen.ru/uploads/2020/01/28/1751686.pdf
    • http://ndtasanantonio.org/uploads/1/3/0/5/130540725/130540725.html#bouncing+ball+games+free++for+pc

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001252.bin
5939da1957d7d53add95ebfc4939926f5f40374e0797f72cdc7850bc07986683		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1252 7524 bytes
font_01_sfnt_off0000528f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x528F 16036 bytes

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