Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b9c830b59c5aca…

MALICIOUS

PDF

51.4 KB Authoring application: Karbon
MD5: da72164afc377b5f896eed96d6abc1a9 SHA-1: 0e235268e04e73a39dcf04acf53b63659d8a3cce SHA-256: 66b9c830b59c5aca243db034000de02205e60fca8a307264710e79ad649a4334
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to external PDF files, indicating a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://looe-festival-of-the-sea.com/uploads/1/3/0/6/130639105/pemodo.pdf
    • http://adrianbyrdcounseling.com/uploads/1/3/0/5/130540281/xopepobizolob.pdf
    • http://thecynicalsage.com/uploads/1/3/0/8/130813332/ef1bfec27b.pdf
    • http://buildajump.com/uploads/1/3/0/3/130313107/1bda0b4cb9.pdf
    • http://dmrcvss.co.uk/uploads/1/3/0/2/130271047/megipomat.pdf
    • http://leapfrogcamo.ca/uploads/1/3/0/3/130379824/ziwijabidad.pdf
    • http://stevenyasell.com/uploads/1/3/0/4/130478057/jasazagiwasot.pdf
    • http://intheom.com/uploads/1/3/0/2/130291800/gusetebasemoze.pdf
    • http://www.threemightychickens.co/uploads/1/3/0/7/130776500/wegaxidipipotapu.pdf
    • http://rulr.org/uploads/1/3/0/5/130540592/ffc915149a.pdf
    • http://sms.shelbyvillebands.com/uploads/1/3/0/7/130775197/rixiju_movodura.pdf
    • http://kierragambrell.com/uploads/1/3/0/3/130313370/5ee55.pdf
    • http://avadhaniestate.net/uploads/1/3/0/7/130738657/2566079.pdf
    • http://aaceglobal.com/uploads/1/3/0/7/130775772/pezufulamip.pdf
    • http://jumanjee.com/uploads/1/3/0/4/130490776/wadixazijam.pdf
    • http://theoilymixer.com/uploads/1/3/0/5/130550949/ca4cf3.pdf
    • http://trainerblueprint.com/uploads/1/3/0/2/130287932/a1c4f1f.pdf
    • http://babylon5cards.com/uploads/1/3/0/8/130813094/levatotesinexup.pdf
    • http://southhillssoccer.org/uploads/1/3/0/5/130543848/130543848.html#hypergeometric+distribution+minimum+sample+size
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f43.bin
5518c15a21c44b98c6916baddc9a1b991d76e2308ba51be03ca595f52d67c89b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F43 16444 bytes
font_01_sfnt_off000068b3.bin
f61952c5e5fae5f88ff198254484d24bda21574c82c030a787c07768592cde66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 9228 bytes

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