Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b2b4b33e1961b3…

MALICIOUS

PDF

27.2 KB Created: 2019-05-02 11:11:26 +01:00 Authoring application: mPDF 5.7 First seen: 2021-10-01
MD5: 5d5618751ca2058cb79df52e2ebfdce6 SHA-1: 56c1453763ec5699fa68f3731db114695be94ec5 SHA-256: a8b2b4b33e1961b3f3e5031b0fa15fa1eb009338b906330369d02d56f4ad01f1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, and a heuristic for a visual download button lure. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://muicuiu.dumb1.com/2a00a06a00a09a09/When-the-Mississippi-Ran-Backwards-Empire-Intrigue-Murder-and-the-New-Madrid-Earthquakes-by-Jay-Feldman.pdf In PDF document text
    • http://muicuiu.dumb1.com/3a04a09a08a00a06/One-Mississippi-Two-Mississippi-Methodists-Murder-and-the-Struggle-for-Racial-Justice-in-Neshoba-County-by-Carol-V-R-George.pdfIn PDF document text
    • http://muicuiu.dumb1.com/9a00a02a03a02/Murder-in-Mississippi-by-John-Safran.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a00a01a07a06a00a07/Bauwerk-in-Der-Autonomen-Gemeinschaft-Madrid-Bauwerk-in-Madrid-Verkehrsbauwerk-in-Der-Autonomen-Gemeinschaft-Madrid-by-Quelle-Wikipedia.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a00a01a07a06a01a01/Autonome-Gemeinschaft-Madrid-Alcala-de-Henares-Bauwerk-in-Der-Autonomen-Gemeinschaft-Madrid-by-Quelle-Wikipedia.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a01a04a09a02a02a02/Life-on-the-Mississippi-1883-by-Mark-Twain-Life-on-the-Mississippi-1883-Is-a-Memoir-by-Mark-Twain-of-His-Days-as-a-Steamboat-Pilot-on-the-Mississippi-River-Before-the-American-Civil-War-and-Also-a-Travel-Book-by-Mark-Twain.pdfIn PDF document text
    • http://muicuiu.dumb1.com/2a07a09a04a02a07/Empire-of-Sin-A-Story-of-Sex-Jazz-Murder-and-the-Battle-for-Modern-New-Orleans-by-Gary-Krist.pdfIn PDF document text
    • http://muicuiu.dumb1.com/9a01a09a05a07/Little-Earthquakes-by-Jennifer-Weiner.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a05a09a01a03a06/Precautions-for-Earthquakes-by-Sanjit-sen.pdfIn PDF document text
    • http://muicuiu.dumb1.com/6a07a08a03a08a08/Marches-of-the-Dragoons-in-the-Mississippi-Valley-An-Account-of-Marches-and-Activities-of-the-First-Regiment-United-States-Dragoons-in-the-Mississippi-Valley-Between-the-Years-1833-and-1850-by-Louis-Pelzer.pdfIn PDF document text
    • http://muicuiu.dumb1.com/6a07a08a03a02a05/Marches-of-the-Dragoons-In-the-Mississippi-Valley-An-Account-of-Marches-and-Activities-of-the-First-Regiment-United-States-Dragoons-in-the-Mississippi-Valley-Between-the-Years-1833-and-1850-by-Louis-Pelzer.pdfIn PDF document text
    • http://muicuiu.dumb1.com/3a00a06a01a01a00/A-Theory-of-Small-Earthquakes-by-Meredith-Maran.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a05a02a03a05a08/A-Letter-Concerning-Earthquakes-Written-in-the-Year-1693-by-John-Flamsteed.pdfIn PDF document text
    • http://muicuiu.dumb1.com/3a06a02a06a05a00/The-Backwards-K-by-J-J-Hebert.pdfIn PDF document text
    • http://muicuiu.dumb1.com/3a08a00a05a07a04/Backwards-Moon-by-Mary-Losure.pdfIn PDF document text
    • http://muicuiu.dumb1.com/6a08a09a02a01a03/Bergson-Thinking-Backwards-by-F-C-T-Moore.pdfIn PDF document text
    • http://muicuiu.dumb1.com/6a08a06a08a01a05/Backwards-to-Britain-by-Jules-Verne.pdfIn PDF document text
    • http://muicuiu.dumb1.com/6a07a03a00a08/Scottsboro-by-Ellen-Feldman.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a05a03a09a05a02/Lucy-by-Ellen-Feldman.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a08a06a04a06/The-Cat-Who-Could-Read-Backwards-Cat-Who-1-by-Lilian-Jackson-Braun.pdfIn PDF document text

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