Malicious PDF — malware analysis report

Static analysis result for SHA-256 096a879f6240bdbc…

MALICIOUS

PDF

53.2 KB Authoring application: Karbon
MD5: a25e1eb2d0603fc85eeb1d7f762b5db0 SHA-1: d337e71d268b3ea6a9a0c5890feecc4da43e4e43 SHA-256: 096a879f6240bdbc66bab13a26bd1c867c278fb29fed5a3e46dc754acf9f8e50
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, a technique often used for SEO poisoning or phishing. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support malicious intent. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings.

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://deeguitar.com/uploads/1/3/0/5/130588318/jasibajuminoluse.pdf
    • http://beachclubproductions.net/uploads/1/3/0/5/130588395/vexepame-nituf-nesalalidorebob.pdf
    • http://nobookingfee.org/uploads/1/3/0/6/130621020/6680567.pdf
    • http://reboundat.com/uploads/1/3/0/6/130620283/130620283.html#the+ring+of+the+dove+pdf
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011a3.bin
b8b5b93f1a5c7231e2a3be3f3572efd4d1cda388d25d3c2d7db0a3df1a8e24ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3 9116 bytes
font_01_sfnt_off00006f3a.bin
ec83d26e36492ca138c758f2f63f9789ddbf9fd49cdbe1b825654455e844e137		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 7224 bytes
font_02_sfnt_off000085d1.bin
65310eb3a7b636246b616b004acd33a86ed6c355533ab5a5088d0ace2913267d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D1 17464 bytes

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