Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dac272bf2258c2…

MALICIOUS

PDF

34.7 KB Authoring application: Smallpdf Desktop
MD5: 17d7bfb1956333d42183c6289e44b7ff SHA-1: 58589ce5196923e75abb9a826b2ac6bbce0b2e21 SHA-256: f1dac272bf2258c20e62b68a3c7676ad5b00fb222a7745126eb2ff2760b4e22f
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, as malicious phishing content. The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', with the primary domain being 'vitalika-stroy.ru'. These links likely serve to distribute malware or redirect users to phishing pages. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vitalika-stroy.ru/uploads/2020/01/28/5777561411124c8.pdf
    • http://phaze1online.com/uploads/1/3/0/2/130289510/zufonimo.pdf
    • http://newhampshireantiquecoop.com/uploads/1/3/0/4/130494289/mabimijug.pdf
    • http://nobuhotelriyadh-fullsite.devsite-1.com/uploads/1/3/0/2/130291827/130291827.html#bechain+mera+dil+hai+song

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001146.bin
ba186c415a1c7ea73265ac907cb26c7be349059ae068f71481112a5895aaa937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1146 8196 bytes
font_01_sfnt_off0000410d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x410D 16036 bytes

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