Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b3713a71866437…

MALICIOUS

PDF

38.8 KB Authoring application: PDFedit
MD5: b018cadcd948077ab15d6f6409d85bb2 SHA-1: 6d4376061fb2349c88f1a762212ef64b6d4467fb SHA-256: 78b3713a7186643755b859d75e16f9ecb34dbd349df05e696e01d8a5526f236e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external websites, disguised as a technical document about Java and Apache POI. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link-farming or redirection scheme. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a malicious intent, likely phishing or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://abetamassage.com/uploads/1/3/0/6/130604018/purizakonosapizose.pdf
    • http://teewit4grownups.com/uploads/1/3/0/7/130740062/fofikotin-vukez-rimit-sidojare.pdf
    • http://jurprofi.info/uploads/2020/01/28/3448761.pdf
    • http://newstylemarket.com/uploads/1/3/0/7/130775940/130775940.html#generate+excel+file+in+java+using+poi

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000104e.bin
24054c3729f2960410efa776b9d9702bcb1972d590646acd4ee720fa1a44abc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E 8864 bytes

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