Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e90df69ad3a3f7e…

MALICIOUS

PDF

39.1 KB Authoring application: Smallpdf Desktop
MD5: b3e6f9dc4c726b8f9da5ae637cf5b7ce SHA-1: 02b04d5c919851e945791fc1309ab723bb7cdd8d SHA-256: 3e90df69ad3a3f7eea0e976bbd1a27f052c29cc1e68bd897279b3d965a5edefb
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 other PDF files. This suggests a tactic to distribute more malicious content or manipulate search engine results. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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 https://nijitilebawiv.weebly.com/uploads/1/3/0/6/130604292/9660877.pdf
    • https://depamilura.weebly.com/uploads/1/3/0/6/130603710/fadadeparepi.pdf
    • http://tutorvirginia.com/uploads/1/3/0/6/130621727/fazopibup.pdf
    • http://rochecenter.org/uploads/1/3/0/2/130292007/130292007.html#hartalega+latest+annual+report

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000f9f.bin
cf4d239142aa7282d922b73a85d9b7344519b410c0794d5b41cc6b87a3940501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F 8620 bytes

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