Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3234c9cb1f5fcd5…

MALICIOUS

PDF

43.2 KB Authoring application: OpenOffice.org
MD5: 9e39cf88af471ab340de418c07cde19d SHA-1: 798c910f898a34f714ef099cf9ca61dde57886c3 SHA-256: a3234c9cb1f5fcd5bce7d2d03851d99fe287b3ce827627277b53821565bb0e7a
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to other PDF files hosted on various domains, suggesting a link farm or phishing campaign. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support the malicious nature of this file. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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://ninthdistrictdems.org/uploads/1/3/0/7/130776420/radisatasezage_savox_wazazaguwe_sexozezap.pdf
    • http://mygoodpaper.com/uploads/1/3/0/4/130488299/9084386.pdf
    • http://bethlauzier.com/uploads/1/3/0/5/130588956/7a58441.pdf
    • http://evagoren.com/uploads/1/3/0/6/130604165/ragubotamip.pdf
    • http://filtrasi.com/uploads/1/3/0/5/130540063/02df5ec94100.pdf
    • http://benetechconnection.com/uploads/1/3/0/2/130273626/visusukudo.pdf
    • http://facebookpostingmadeeasy.com/uploads/1/3/0/4/130436095/zoxufunimedewipu.pdf
    • http://waarmte.nl/uploads/1/3/0/5/130550938/e4348.pdf
    • http://wyomingvalleymedical.com/uploads/1/3/0/4/130476401/f746f7534522.pdf
    • http://arbexamsupport.com/uploads/1/3/0/8/130874395/2465837.pdf
    • http://pcrevert.net/uploads/1/3/0/2/130287976/3146610.pdf
    • http://pawsitivelycountry.org/uploads/1/3/0/2/130289220/7869070.pdf
    • http://webdisk.ride-africa.co.za/uploads/1/3/0/7/130738892/mosofosi.pdf
    • http://bluezone2030.com/uploads/1/3/0/5/130543240/130543240.html#structural+functionalism+definition+word

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035e3.bin
339281639fa83e7c3885c8ebd610acd27a14a105297bc45ca22bb4f7dfe244c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35E3 16428 bytes
font_01_sfnt_off00004f1b.bin
fed387bda590cc6a7ce9617d72ae104596a30806b085278cab647d376cb74f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F1B 8392 bytes

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