Malicious PDF — malware analysis report

Static analysis result for SHA-256 03aafef2993ffdb7…

MALICIOUS

PDF

58.8 KB Authoring application: LibreOffice Draw
MD5: 47d6c0ca03856bc9a42fe9e6524effa0 SHA-1: 5bae2fa7bf9c872c0cd85fd913cd99a1f2f6886f SHA-256: 03aafef2993ffdb75578366551225f824d202f31ba51ac60c1cd8db2d8c0addd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are the primary indicators of compromise, suggesting a link farm or distribution network.

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.Dropper.Agent-7891308-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7891308-0
  • 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://zaxu.militaryfreak.com/uploads/2020/01/27/rusijikuzaroxawoxog.pdf
    • http://dcooley497.com/uploads/1/3/0/4/130488975/1973445.pdf
    • http://carpetcleaningsv.com/uploads/1/3/0/3/130379232/7726636.pdf
    • http://jamesradack.net/uploads/1/3/0/5/130540559/gabukiledaz-sesejavami.pdf
    • http://afcyberworx.us/uploads/1/3/0/5/130551237/rinaro.pdf
    • http://borders.space/uploads/1/3/0/3/130379336/taxuwagoviwiro_sovuvukawu.pdf
    • http://sar.lumiprint.ru/uploads/2020/01/28/siwomogofaf-resifinekedi.pdf
    • http://northshoreplaytherapy.com/uploads/1/3/0/2/130273798/6e64374a3.pdf
    • http://thelizardbarn.com/uploads/1/3/0/4/130488357/d1dc4.pdf
    • http://karmafx.pro/uploads/2020/01/29/vikaxugi.pdf
    • http://mrhowe.org/uploads/1/3/0/5/130545434/lonujolazolonewiko.pdf
    • https://kulovegubitoga.weebly.com/uploads/1/3/0/5/130588968/3759155.pdf
    • http://nursingarmpillow.com/uploads/1/3/0/2/130288753/130288753.html#asherman%27s+syndrome+risk+factors
    • 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_off000011a5.bin
d911ac4b7cf318fa025129893cd4f92f41b3f06c6e8d76db26083a7b966be709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5 9940 bytes
font_01_sfnt_off0000a09f.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA09F 16036 bytes

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