Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e60db300cf03ef…

MALICIOUS

PDF

34.7 KB Authoring application: Smallpdf Desktop
MD5: bcacb4bd4ee552e6688c99b30737e6b3 SHA-1: 568123c2b86151ef032fb2430ca82dbaa9d170cd SHA-256: e3e60db300cf03eff6fc7cc2f59beea1fbaddce23b0ebe0d4f615608c9da3310
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV also flagged this file as malicious, specifically as phishing-related. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://govomutar.bonita-casa.ru/uploads/2020/01/29/laleti.pdf
    • http://doctorberrytherapy.com/uploads/1/3/0/6/130639146/d85db1f3.pdf
    • http://myoppconsulting.com/uploads/1/3/0/5/130588444/devesa.pdf
    • http://zambiasafarihunting.com/uploads/1/3/0/6/130640150/130640150.html#afiliar+banco+bicentenario+nueva+plataforma

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fe5.bin
f333233226e2f05f30477c0d9f628bce6371da13b670386ae3b636161eeb3b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5 9000 bytes

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