Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b33537e40ec9e9e…

MALICIOUS

PDF

32.5 KB Authoring application: SWFTools
MD5: eaf8763b432f7d7d7b29530837d27081 SHA-1: 74d50b8990394e105990785087598a9b994ab4ed SHA-256: 6b33537e40ec9e9e28e95bb31b38854bb05a6c90600ae6fb24dcde441993bc1a
152 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. The document body contains numerous URLs pointing to other PDF files, suggesting a tactic to distribute content or potentially malware across many domains. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to external resources.

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://wukepu.detskepovidky.com/uploads/2020/01/28/5763b09e78.pdf
    • http://mistercornejo.org/uploads/1/3/0/6/130621897/5456940.pdf
    • http://contiex.info/uploads/2020/01/29/3502442.pdf
    • https://nasazutebil.weebly.com/uploads/1/3/0/5/130589312/megefediwez.pdf
    • http://boyde-studios.com/uploads/1/3/0/3/130313316/wofagogulikujij.pdf
    • http://buxe.gost-stroy.com/uploads/2020/01/27/wosuj_ziligiti.pdf
    • http://xsaia.org/uploads/1/3/0/3/130324270/tewolikexixikeso.pdf
    • https://kolujedopiz.weebly.com/uploads/1/3/0/4/130476120/firasu-jajidofivuk-levirejefalav-pagik.pdf
    • http://dancinggoatsanctuary.com/uploads/1/3/0/2/130272631/130272631.html#happy+birthday+song++video+with+name

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001192.bin
8bf33893c8bef50c77f8e36463d2b55a4e30b48c192cf53f912b034befc775c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192 7856 bytes

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