Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fbfd32fd01a7f1…

MALICIOUS

PDF

15.7 KB Created: 2019-05-02 05:08:22 +01:00 Authoring application: mPDF 5.7
MD5: 05049c9d37a717a1e7d7f6afa5fa572d SHA-1: 1cc89d024eb34a9326b3998dc397be1ca1bbc720 SHA-256: 21fbfd32fd01a7f16c063b609d6750243289813c780b49062b0c78d27d917f8e
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to manipulate search engine results or distribute content. While the ML classifier also flagged this PDF as malicious, the specific nature of the attack is unclear due to the lack of executable scripts or readable document body content. The primary IOCs are the numerous URLs embedded within the document.

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.co
    • http://cefasfese.4pu.com/3737737736732732/I-Am-Your-Sister-by-Ericka-K-F-Simpson.pdf
    • http://cefasfese.4pu.com/2731731739736730/Dear-Hearts-by-Ericka-Clay.pdf
    • http://cefasfese.4pu.com/1731736735737732/Stuck-in-the-Middle-Sister-to-Sister-1-by-Virginia-Smith.pdf
    • http://cefasfese.4pu.com/9731736739731/I-Have-a-Sister--My-Sister-Is-Deaf-by-Jeanne-Whitehouse-Peterson.pdf
    • http://cefasfese.4pu.com/4737739734730732/Sister-Light-Sister-Dark-by-Jane-Yolen.pdf
    • http://cefasfese.4pu.com/1732735733732731/The-Other-Sister-Sister-Series-1-by-Leanne-Davis.pdf
    • http://cefasfese.4pu.com/3737733731739736/Leaving-Cloud-9-The-True-Story-of-a-Life-Resurrected-from-the-Ashes-of-Poverty-Trauma-and-Mental-Illness-by-Ericka-Andersen.pdf
    • http://cefasfese.4pu.com/6735733730734730/Big-Sister-Little-Sister-by-LeUyen-Pham.pdf
    • http://cefasfese.4pu.com/4734734731730730/-quot-D-quot-is-for-Dysfunctional-by-Ericka-Clay.pdf
    • http://cefasfese.4pu.com/3734735732731736/The-Sister-Circle-The-Sister-Circle-Series-1-by-Vonette-Bright.pdf
    • http://cefasfese.4pu.com/4736733733735730/Sister-Sister-by-Sue-Fortin.pdf
    • http://cefasfese.4pu.com/2737732738730732/My-Big-Sister-Lives-in-a-Fantasy-World-The-World-s-Strongest-Little-Brother-My-Big-Sister-Lives-in-a-Fantasy-World-1-by-Tsuyoshi-Fujitaka.pdf
    • http://cefasfese.4pu.com/5731730736735730/Is-by-Anne-Simpson.pdf
    • http://cefasfese.4pu.com/1739734730730739/Anywhere-but-Here-by-Mona-Simpson.pdf
    • http://cefasfese.4pu.com/4739736738739733/Dragon-Eye-by-Anna-Simpson.pdf
    • http://cefasfese.4pu.com/2730731733736732/Quick-by-Anne-Simpson.pdf
    • http://cefasfese.4pu.com/2732731732738733/Act-of-Grace-by-Karen-Simpson.pdf
    • http://cefasfese.4pu.com/2732734739738730/Where-the-Trees-Were-by-Inga-Simpson.pdf
    • http://cefasfese.4pu.com/4736737737737733/Argos-by-Phillip-W-Simpson.pdf
    • http://cefasfese.4pu.com/1735732738733737/Fourwar-by-Nathan-E-Simpson.pdf

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