Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed90d574370bdc50…

MALICIOUS

PDF

43.3 KB Authoring application: Karbon
MD5: 28dc3fab5bb415b5b37df4791ef2899e SHA-1: f10ac19dfc39bac5db7bc3bbf505b1e473756b91 SHA-256: ed90d574370bdc50c6e241da57b63afa7acfd8b7916364d7c905c5cf013e18d8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique commonly used for SEO poisoning or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic PDF_SEO_LINK_FARM specifically identifies the mass external PDF link farm, with the first URL being http://kreativekups.com/uploads/1/3/0/6/130620750/8553893.pdf. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://kreativekups.com/uploads/1/3/0/6/130620750/8553893.pdf
    • http://ajointvisionllc.com/uploads/1/3/0/5/130541688/1ca3376c0.pdf
    • http://fnmiec.ca/uploads/1/3/0/8/130813899/5aedb6c6fc7.pdf
    • http://www.sesimbranaturapark.com/uploads/1/3/0/6/130639573/petirilap-butoxobawuza.pdf
    • http://doicontrol.com/uploads/1/3/0/2/130288762/6409268.pdf
    • http://affordablewarbird.com/uploads/1/3/0/7/130739949/4557645.pdf
    • http://luciestarr.net/uploads/1/3/0/5/130543092/niwudadesudaz.pdf
    • http://skinnytiffy.com/uploads/1/3/0/2/130272071/2005188.pdf
    • http://little-hugs.com/uploads/1/3/0/4/130483067/3201635.pdf
    • http://bewellred.net/uploads/1/3/0/3/130323672/9031228.pdf
    • http://goldago.com/uploads/1/3/0/2/130289595/2118505.pdf
    • http://cslawnmaintenance.com/uploads/1/3/0/7/130776727/1093129.pdf
    • http://rachaelcrevier.com/uploads/1/3/0/7/130739640/7060051.pdf
    • http://www.matelaslitmural.com/uploads/1/3/0/3/130313123/3187495.pdf
    • http://noisomheden.com/uploads/1/3/0/6/130604777/6403646.pdf
    • http://jonnyspartay.com/uploads/1/3/0/2/130289736/b45d915e.pdf
    • http://lbichef.com/uploads/1/3/0/6/130604803/talasimobubojugi.pdf
    • http://chemicalfingerprints.com/uploads/1/3/0/6/130620859/xinewepasibadew_tumegumexut_nalewam.pdf
    • http://nosceteipsum.co.uk/uploads/1/3/0/5/130589308/duvubigidezukexabur.pdf
    • http://www.lindsayumlahrhn.com/uploads/1/3/0/7/130738928/rupagudipe.pdf
    • http://patronus-security.com/uploads/1/3/0/6/130604737/4649037.pdf
    • http://projectrsvp.com/uploads/1/3/0/4/130475938/widepaxitafod.pdf
    • http://tayanaschildcare.com/uploads/1/3/0/8/130813881/todenanutot_wuxudul.pdf
    • http://msusnackbox.com/uploads/1/3/0/4/130488243/5538214.pdf
    • http://bernardobellostudio.com/uploads/1/3/0/2/130288710/130288710.html#convertitore+da+pdf+a+dwg+gratis

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000450f.bin
f2c4375edd129e3fa78e58695f3b25d624ce65184fec14c5182668ce69baf754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x450F 8956 bytes

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