Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ca81cbb398dbfe…

MALICIOUS

PDF

40.2 KB Authoring application: LibreOffice
MD5: 078a3337b73022fa8358c91d9c5ae9c5 SHA-1: 9701df68dec2836c03503aa9ff535bfdf5a84cc3 SHA-256: b6ca81cbb398dbfe84f45fefae8a982023672164bbb07fa607bbb132fec52cd0
150 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 hosted on various domains. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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://28bullets.com/uploads/1/3/0/4/130483408/wutelefa-rotedarez-duwukogori.pdf
    • http://hangxao.com/uploads/2020/01/28/tikulusilop-zabufo-lekevigal.pdf
    • http://kinfolkfamilyhealth.shop/uploads/1/3/0/4/130476589/7529573.pdf
    • http://ottawawalkingdream.ca/uploads/1/3/0/3/130313179/b49ef53ecdff.pdf
    • http://bazarym.com/uploads/2020/01/28/xesotawofuwo.pdf
    • http://oakhillcontractorsllc.net/uploads/1/3/0/5/130550955/bcbec1bdec3862.pdf
    • http://rootfivefarm.com/uploads/1/3/0/5/130539311/2c70d.pdf
    • http://nursingarmpillow.com/uploads/1/3/0/2/130289379/130289379.html#iron+horse+maverick+4.+5

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000112d.bin
50feb960248db23e13f5bd03db53089873f37b74b2f8d235ac2466d48ac56e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D 7868 bytes
font_01_sfnt_off00005705.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 16036 bytes

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