Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd8366beeb8ed8f…

MALICIOUS

PDF

38.6 KB Authoring application: Smallpdf Desktop
MD5: 1ee964585f0e79de2a1c39ea198ec313 SHA-1: 5c80a1660ece1be74404626c7e8ddb22f23dc29f SHA-256: 2fd8366beeb8ed8f03dfcbdbcbd9463c6f272a94d2fe263328f21d28d042c364
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule and ClamAV detection for phishing. The document body, though partially corrupted, contains references to 'Smallpdf Desktop' and 'Cirurgia de hernia inguinal pdf', suggesting a lure. The embedded URLs point to external PDF files, reinforcing the link farm heuristic and indicating a potential phishing or malicious redirection attempt.

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://velvetleafglobal.com/uploads/1/3/0/6/130639950/rawexilixoxeb-puxotodidenitul.pdf
    • http://whereismyeraser.com/uploads/1/3/0/6/130622104/df057fdde5.pdf
    • http://maplevalleyplastic.net/uploads/1/3/0/4/130478935/xanurexiwom.pdf
    • http://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/6/130620471/130620471.html#cirurgia+de+hernia+inguinal+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000100b.bin
ce95528e0f0f68eecd1a13432eeb747f879e40d5bf11226e997c67d4c2f8ce47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B 10004 bytes

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