Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07ee8ec07ceb7fe…

MALICIOUS

PDF

15.1 KB Created: 2019-10-31 23:52:19 +00:00 Authoring application: mPDF 5.7 First seen: 2021-10-23
MD5: c86468eefddadaa5798681565af5cbba SHA-1: 196fac7c8aea5f9d14ce4c575900d987f1e414db SHA-256: a07ee8ec07ceb7fee93e65bc880d944d47829030da5c51514ad6b0300d108443
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, identified as a link farm. While the URLs themselves are currently classified as benign, the sheer volume and the heuristic firing of 'PDF_SEO_LINK_FARM' suggest a malicious intent, possibly for SEO manipulation or to host further malicious content. The ML classifier also flagged the document as malicious with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9798

Heuristics 2

  • 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.
  • 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://cefasfese.4pu.com/4736731739732736/A-Silent-Voice-Volume-2-A-Silent-Voice-2-by-Yoshitoki-Oima.pdf In PDF document text
    • http://cefasfese.4pu.com/8734738/A-Silent-Voice-Volume-1-A-Silent-Voice-1-by-Yoshitoki-Oima.pdfIn PDF document text
    • http://cefasfese.4pu.com/2730733738732738/-1-Koe-no-Katachi-1-A-Silent-Voice-1-by-Yoshitoki-Oima.pdfIn PDF document text
    • http://cefasfese.4pu.com/4732736731736731/To-Your-Eternity-Vol-1-by-Yoshitoki-Oima.pdfIn PDF document text
    • http://cefasfese.4pu.com/9731733730731734/The-Art-of-Voice-Acting-The-Craft-and-Business-of-Performing-for-Voice-Over-by-James-R-Alburger.pdfIn PDF document text
    • http://cefasfese.4pu.com/2738730732732738/Voice-Over-Seiyu-Academy-Vol-1-Voice-Over-1-by-Maki-Minami.pdfIn PDF document text
    • http://cefasfese.4pu.com/5734739733732/The-Silent-Soldiers-Back-To-School-The-Silent-Soldiers-2-by-Travis-Stinnett.pdfIn PDF document text
    • http://cefasfese.4pu.com/2738733738735730/Voice-or-Noise-Volume-1-by-Yamimaru-Enjin.pdfIn PDF document text
    • http://cefasfese.4pu.com/5736731735730/A-Silent-Promise-Volume-1-by-Namrata-Gupta.pdfIn PDF document text
    • http://cefasfese.4pu.com/1737731730731735/Her-Master-s-Voice-Her-Master-s-Voice-1-2-by-Vivien-Sparx.pdfIn PDF document text
    • http://cefasfese.4pu.com/3736733738733735/Voice-Of-Muse-Unarius-Elysium-The-Pulse-Of-Creation-Volume-5-by-Ernest-L-Norman.pdfIn PDF document text
    • http://cefasfese.4pu.com/2734737733736738/Silent-No-More-Silent-1-by-N-E-Henderson.pdfIn PDF document text
    • http://cefasfese.4pu.com/3738733737738739/A-Silent-Canvas-Part-1-A-Silent-Canvas-1-by-Melissa-Ann.pdfIn PDF document text
    • http://cefasfese.4pu.com/4736739739730733/The-Voice-by-Anne-Bishop.pdfIn PDF document text
    • http://cefasfese.4pu.com/3737737736730734/Voice-by-Joseph-Garraty.pdfIn PDF document text
    • http://cefasfese.4pu.com/1734732738739732/A-Voice-from-Elsewhere-by-Maurice-Blanchot.pdfIn PDF document text
    • http://cefasfese.4pu.com/4734730738/Archer-s-Voice-by-Mia-Sheridan.pdfIn PDF document text
    • http://cefasfese.4pu.com/2734738736736730/Archer-s-Voice-by-Mia-Sheridan.pdfIn PDF document text
    • http://cefasfese.4pu.com/9735734731737734/Her-Voice-of-Reason-by-Ola-Wegner.pdfIn PDF document text
    • http://cefasfese.4pu.com/9735735731735732/A-Voice-in-the-Wilderness-by-E-Hornung.pdfIn PDF document text

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