Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3ffa98d68f9f23…

MALICIOUS

PDF

15.2 KB Created: 2019-05-02 17:36:38 +01:00 Authoring application: mPDF 5.7 First seen: 2020-12-28
MD5: 1c9fd0bba3ccfb8213edd80fae214235 SHA-1: 2cf2a503c11b88ecdeb75aea98c3e6144c5498cf SHA-256: af3ffa98d68f9f233324e6fc3df164b71296e62f44044ec3cc8d35c506d426bd
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to external PDFs on the domain 'cefasfese.4pu.com'. This heuristic firing indicates a potential SEO poisoning or link farm attack. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely to redirect users to malicious content or phishing sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

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/2736734736732730/The-Storm-by-August-Strindberg.pdf In PDF document text
    • http://cefasfese.4pu.com/4737734733734737/Three-Plays-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/1731737731732736738/Heiraten-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/2739738739730734/The-Stronger-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/2736734736734733/Easter-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/4731739732736732/Miss-Julie-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/8737735730739/A-Dream-Play-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/3739737732737733/Miss-Julie-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/8738736733733732/From-an-Occult-Diary-Marriage-With-Harriet-Bosse-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/4735736734737737/The-Road-to-Damascus-by-John-Ringo.pdfIn PDF document text
    • http://cefasfese.4pu.com/3732734733732736/Grayback-Long-Road-to-Damascus-by-S-H-Ford.pdfIn PDF document text
    • http://cefasfese.4pu.com/3730734731737735/There-Are-Crimes-and-Crimes-by-August-Strindberg.pdfIn PDF document text
    • http://cefasfese.4pu.com/1737731738738735/August-Heat-Men-of-August-4-by-Lora-Leigh.pdfIn PDF document text
    • http://cefasfese.4pu.com/2734733735732737/The-Gospel-of-Damascus-by-Omar-Imady.pdfIn PDF document text
    • http://cefasfese.4pu.com/1735730734733/Damascus-Gate-by-Robert-Stone.pdfIn PDF document text
    • http://cefasfese.4pu.com/2735737734733739/Light-Horse-To-Damascus-by-Elyne-Mitchell.pdfIn PDF document text
    • http://cefasfese.4pu.com/3734737734733736/By-Desert-Ways-to-Baghdad-and-Damascus-by-Louisa-Jebb.pdfIn PDF document text
    • http://cefasfese.4pu.com/1731732732737739734/Emma-Eine-Familiengeschichte-in-Zwen-Theilen-Von-August-LaFontaine-by-August-Lafontaine.pdfIn PDF document text
    • http://cefasfese.4pu.com/2730737733733732/Strindberg-s-Star-by-Jan-Wallentin.pdfIn PDF document text
    • http://cefasfese.4pu.com/1732730738737739/A-Disappearance-in-Damascus-A-Story-of-Friendship-and-Survival-in-the-Shadow-of-War-by-Deborah-Campbell.pdfIn PDF document text

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