Malicious PDF — malware analysis report

Static analysis result for SHA-256 936d1de8ad66e212…

MALICIOUS

PDF

36.4 KB Authoring application: Nitro PDF
MD5: c3392a292f814e666364bd51877f9e36 SHA-1: 7468a0e19d9dfe0d766e20d76fb0e79b5ee77437 SHA-256: 936d1de8ad66e212df9d4f07239643fe60cc000c62546856a9fca1027b66aacf
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to external PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this file as malicious. No scripts were extracted from this sample.

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://walterwanderley.com/uploads/1/3/0/5/130547405/4865820.pdf
    • http://mytjscatering.com/uploads/1/3/0/5/130550847/6090596.pdf
    • http://coppiceandcanvas.com/uploads/1/3/0/2/130271121/605adb2f6.pdf
    • http://hotelkalaja.net/uploads/1/3/0/2/130288854/9227423.pdf
    • http://convegnoartemercatosiena.com/uploads/1/3/0/5/130539714/6209255.pdf
    • http://richardturner.net/uploads/1/3/0/3/130313670/geronaxigezikil.pdf
    • http://www.tarzan.online/uploads/1/3/0/2/130289524/pasosubamekoduxubup.pdf
    • http://pauldini.net/uploads/1/3/0/3/130313180/pogoxewepakera.pdf
    • http://electrodomesticosonline.com/uploads/1/3/0/2/130289399/toxipugesinu_lolusutupexuzu.pdf
    • http://mesabimusicaltheatre.com/uploads/1/3/0/4/130492963/gezixiti.pdf
    • http://noblemobileco.com/uploads/1/3/0/6/130605368/wopigijofutor.pdf
    • http://gotmonks.net/uploads/1/3/0/5/130550742/3831934.pdf
    • http://paparazziservices.com/uploads/1/3/0/2/130271081/mimewixufimamap-voximibiv-lomejita.pdf
    • http://rationalstudio.com/uploads/1/3/0/6/130604022/lamot-pofuzuligegoser-jatexanaben.pdf
    • http://russianboutique.co.uk/uploads/1/3/0/7/130776828/sitimifiriz.pdf
    • http://nofilterbydreah.com/uploads/1/3/0/3/130313613/61886.pdf
    • http://destinationdesignreunion.com/uploads/1/3/0/5/130551230/4814890.pdf
    • http://www.saratogaad.com/uploads/1/3/0/6/130603985/130603985.html#physical+appearance+vocabulary+list+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001ced.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CED 16036 bytes
font_01_sfnt_off000033c5.bin
c153e18c89a111f25bfbd4347912ac7210cb34829a9b234cb7f575e1508f941c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C5 7496 bytes

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