Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c42a34964036b2…

MALICIOUS

PDF

36.8 KB Authoring application: OpenOffice.org
MD5: e56cdc1ae5d01bd63ca298a25461d3d8 SHA-1: 609966c82700f91e5fe0ef06d6f51459ac7ef8e9 SHA-256: 54c42a34964036b23aa56a6b3aca59dc46bf624903e3ae8c56bec89ff3b5c540
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear user-facing text, but the heuristic firings point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://emmett-technique.us/uploads/1/3/0/7/130776486/jijad_kitorijope_goxilix.pdf
    • http://duplexdoctor.com/uploads/1/3/0/6/130639750/6e472.pdf
    • http://bubblyfun.com/uploads/1/3/0/4/130435601/9573618.pdf
    • http://clickpaydemo.com/uploads/1/3/0/3/130323750/ropixikeg.pdf
    • http://aroundtheworldin80minutes.org/uploads/1/3/0/7/130775639/vobakexufi.pdf
    • http://www.societysforgottenchildren.com/uploads/1/3/0/6/130621072/dewukari.pdf
    • http://nyishi.net/uploads/1/3/0/4/130488811/gutubedemujulo.pdf
    • http://ablehorsewomanship.com/uploads/1/3/0/7/130776079/xujigov.pdf
    • http://www.faithworkscrc.org/uploads/1/3/0/4/130476611/zowufejisejugiropuki.pdf
    • http://nrsmallgroups.com/uploads/1/3/0/6/130640042/susepikar.pdf
    • http://danecompany.com/uploads/1/3/0/6/130621292/188641a.pdf
    • http://bedrockwelding.com/uploads/1/3/0/5/130551472/nimozufodudozu_wajajifag_tegasil_fanigekesewitu.pdf
    • http://webdisk.t2troubleshooting.com/uploads/1/3/0/9/130969433/130969433.html#philippines+vs+italy+fiba+2019+score
    • http://nyishi.net/uploads/1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003508.bin
2533feee79a5e073384eb3cd3029cb584171947cc74d689e74e1c0b5c1022670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3508 8864 bytes

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