Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e512a9e2783fb8…

MALICIOUS

PDF

33.9 KB Authoring application: pdf-parser
MD5: 9b9811beddec216aebaa9c22f4ffeb40 SHA-1: e70ebe000d66b5e8e0c10f6542ce649654906b1e SHA-256: 24e512a9e2783fb8f5500db72f651df73ae0b78ef2d4cb882bf0eaa8d421465a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic PDF_SEO_LINK_FARM specifically identifies the mass linking behavior, with the dominant host being bocaijing.f18.ebkf.org. No scripts were extracted, but the document body is heavily corrupted and unreadable.

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://bocaijing.f18.ebkf.org/uploads/1/3/0/6/130621194/pagagudekarudumon.pdf
    • http://cloudbits.org/uploads/1/3/0/2/130289649/kofomeru.pdf
    • http://www.beers.sg/uploads/1/3/0/5/130589227/6b0483b23789.pdf
    • http://brownbossyandbold.com/uploads/1/3/0/6/130604907/2761796.pdf
    • http://josephdanielglobal.net/uploads/1/3/0/8/130813917/dutoranejimegunox.pdf
    • http://dazedandinfusedcatering.com/uploads/1/3/0/9/130969465/387068.pdf
    • http://kidsciencenews.net/uploads/1/3/0/2/130270991/5552855.pdf
    • http://hostmaster.yeastlipidconference.com/uploads/1/3/0/5/130540033/cda64f403f.pdf
    • http://mtwestinspections.com/uploads/1/3/0/5/130551331/sisivogew-biwizu-gizona-megevafonoli.pdf
    • http://420productionsok.com/uploads/1/3/0/4/130488512/bumogutokamekaw.pdf
    • http://mindactionplan.com/uploads/1/3/0/4/130483507/dabonuxakagifanodado.pdf
    • http://st3vy.bpmtc.com/uploads/1/3/0/6/130639905/130639905.html#very+hungry+caterpillar+printable

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002cbf.bin
3ae498f979b8f1d73a375b0db6099813b3ce640817a9208e44008e20a51833a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBF 8016 bytes

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