Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5078450ee6db15…

MALICIOUS

PDF

33.1 KB Authoring application: Smallpdf Desktop
MD5: 33deb57a74f053ab1cb77f05eb5d02db SHA-1: 3d624e4528b8501eca6f845dad3599e29d775313 SHA-256: bc5078450ee6db15c82af872ecd04f1434a8c364c4a55b229c7e3718cc495009
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 and the ML classifier output strongly indicate malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nycartsed.com/uploads/1/3/0/6/130604658/wibobozumez_ridilowamud_vopekujekomim.pdf
    • http://michaeltaylorwrites.com/uploads/1/3/0/6/130604581/97c0bbed.pdf
    • http://bestofthemenu.com/uploads/1/3/0/3/130313002/wepulokezawonita.pdf
    • http://arctictreasures.shop/uploads/1/3/0/3/130324351/lakiwudom-ritasuwopufepan.pdf
    • http://toponsitewellness.com/uploads/1/3/0/4/130477036/vudomokuvajokume.pdf
    • http://carbonneutralnetworks.com/uploads/1/3/0/3/130313466/3031131.pdf
    • http://hello-baby-toys.com/uploads/1/3/0/3/130312965/130312965.html#compound+rectangles+area+worksheet+tes

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000112b.bin
137cf9ebaf711e746000569701a56d5470319ab73ab9d9c6d58e3b8833bbc361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112B 8416 bytes

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