Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb72833d659a2412…

MALICIOUS

PDF

19.2 KB Created: 2019-06-04 08:23:28 +01:00 Authoring application: mPDF 5.7
MD5: b18e53dd7a913c2e23c663d5586483e0 SHA-1: c1b9a6aa59124a79ad6be516e33b4ba4e950dc00 SHA-256: fb72833d659a24127c8a908370f4955f0ff23a0ec04e72af80b1efd650fd5463
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to external PDF files, hosted on the domain 'cefasfese.4pu.com'. This behavior is indicative of a link farm or a distribution point for malicious content, despite the individual linked PDFs being marked as benign. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

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/4730730732732735/A-Life-s-Work-On-Becoming-a-Mother-by-Rachel-Cusk.pdf
    • http://cefasfese.4pu.com/2734735738730733/Aftermath-On-Marriage-and-Separation-by-Rachel-Cusk.pdf
    • http://cefasfese.4pu.com/2735735731739739/The-Outline-of-History-Vol-1-of-2-by-H-G-Wells.pdf
    • http://cefasfese.4pu.com/5736738731737731/An-Outline-of-Philosophy-by-Bertrand-Russell.pdf
    • http://cefasfese.4pu.com/1731734731731731733/Dogmatics-in-Outline-by-Karl-Barth.pdf
    • http://cefasfese.4pu.com/6733738737735733/Schaum-s-Outline-of-Precalculus-by-Fred-Safier.pdf
    • http://cefasfese.4pu.com/6733738738730734/Schaum-s-Easy-Outline-of-Precalculus-by-Fred-Safier.pdf
    • http://cefasfese.4pu.com/7737731731737738/Critical-amp-High-Acuity-Outline-by-Audree-Reynolds.pdf
    • http://cefasfese.4pu.com/1730733737732735/An-Outline-of-Orthodox-Patristic-Dogmatics-by-John-S-Romanides.pdf
    • http://cefasfese.4pu.com/6731738739739739/An-Outline-of-the-Phonology-and-Morphology-of-Old-Provencal-by-Charles-Hall-Grandgent.pdf
    • http://cefasfese.4pu.com/1731735738733731730/Biblical-Theology-in-Outline-The-Vitality-of-the-Word-of-God-by-Klaus-N-rnberger.pdf
    • http://cefasfese.4pu.com/4732734731738737/Resurrection-and-Moral-Order-An-Outline-for-Evangelical-Ethics-by-Oliver-O-39-Donovan.pdf
    • http://cefasfese.4pu.com/2735732731732734/Against-Method-Outline-Of-An-Anarchistic-Theory-Of-Knowledge-by-Paul-Karl-Feyerabend.pdf
    • http://cefasfese.4pu.com/7735736739739/Rachel-s-Tears-The-Spiritual-Journey-of-Columbine-Martyr-Rachel-Scott-by-Beth-Nimmo.pdf
    • http://cefasfese.4pu.com/2735736736737732/The-Penal-Settlement-of-Macquarie-Harbour-1822-1833-An-Outline-of-its-History-by-Hans-Julen.pdf
    • http://cefasfese.4pu.com/1738732733737735/Rachel-and-the-Many-Splendored-Dreamland-Rachel-Griffin-3-by-L-Jagi-Lamplighter.pdf
    • http://cefasfese.4pu.com/7735733732735733/Student-s-Solution-Manual-An-Outline-for-the-Study-of-Calculus-TC7-Louis-Leithold-Vol-1-Chapters-1-4-by-Leon-Gerber.pdf
    • http://cefasfese.4pu.com/1730739732739739731/Georg-Wilhelm-Friedrich-Hegel-Encyclopaedia-of-the-Philosophical-Sciences-in-Basic-Outline-by-Klaus-Brinkmann.pdf
    • http://cefasfese.4pu.com/9737736739736730/Rachel-The-Story-of-Rachel-Carson-by-Amy-Ehrlich.pdf
    • http://cefasfese.4pu.com/4739733735738737/The-Strange-Case-of-Rachel-K-by-Rachel-Kushner.pdf
    • http://cefasfese.4pu.com/673173

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