Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb9ce775758689e…

MALICIOUS

PDF

38.2 KB Authoring application: PDFBox
MD5: 04cfd5d4a56c8ab49b5308af7e6f540a SHA-1: cd5d32c5b7a83ccb5ebfcb5bb54e3027a36864ab SHA-256: 8bb9ce775758689e40c4ad8585cbd3a1f60d26fd54be1d174746e728ea1eeb88
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of embedded URLs pointing to external PDF files. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass link farm, suggesting the document's purpose is to redirect users to potentially malicious content. The embedded URLs are the primary indicators of compromise.

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://vejimera.ethcryptobank.biz/uploads/2020/01/29/9932322.pdf
    • http://nemuno.olegdfr.fr/uploads/2020/01/28/ruruk.pdf
    • http://ford-classc.com/uploads/1/3/0/5/130588492/99f56bf791aa20.pdf
    • https://buzulefixifimi.weebly.com/uploads/1/3/0/6/130605269/6869571.pdf
    • https://wunokumonorusis.weebly.com/uploads/1/3/0/4/130476709/bimuremupuzazem-gazesolitogaru-worederuganojem.pdf
    • https://vujatixi.weebly.com/uploads/1/3/0/4/130435937/2222343.pdf
    • http://gofawavu.pdazip.ru/uploads/2020/01/28/raxiwul-lufigari-darisegujogemig.pdf
    • https://neburifagego.weebly.com/uploads/1/3/0/5/130550830/6436948.pdf
    • https://masaduvezima.weebly.com/uploads/1/3/0/5/130551166/5944640.pdf
    • http://sizopap.wifiavto.ru/uploads/2020/01/27/xoluwafelituvudap.pdf
    • http://compassioncounselling.com/uploads/1/3/0/4/130435851/8222350.pdf
    • http://breastfeedingcork.com/uploads/1/3/0/5/130589449/pifuvebiluge_koregenamoliges_dedidade_fezujefir.pdf
    • http://jemudidox.sascharoseescort.com/uploads/2020/01/28/bozuxo.pdf
    • http://purensimpleohio.com/uploads/1/3/0/5/130540559/02152cde4923fa.pdf
    • http://afbrewco.com/uploads/1/3/0/5/130539338/vajajamajasusomoguxe.pdf
    • https://lidusukexod.weebly.com/uploads/1/3/0/3/130313702/zabijemuvevimi-zotakusilos.pdf
    • http://rud.atendimento-banking-online.com/uploads/2020/01/27/wirivav.pdf
    • https://nugojorazum.weebly.com/uploads/1/3/0/5/130551192/1232441.pdf
    • http://kepapeduf.ars-shipping.com/uploads/2020/01/28/dozonilevobab_fizukamenopez_fojeluzevu.pdf
    • http://beyoutiful.ca/uploads/1/3/0/5/130551033/barelobe.pdf
    • http://venenodeescorpion.com/uploads/1/3/0/6/130604658/3c24600041aa.pdf
    • http://lizamaroni.com/uploads/1/3/0/2/130289332/bagadekef_buwigo_piwumemoke_vavis.pdf
    • http://zodokovat.geltser.info/uploads/2020/01/27/wuwabu.pdf
    • http://tcsonline.net/uploads/1/3/0/3/130323592/130323592.html#converting+fractions+to+decimals+worksheet+year+5

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000017a2.bin
ea59b3a017db8c14359bb303a34b9eb6ea1f0cdcf91be4bfb50dd895635ae6ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A2 8576 bytes

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