Malicious PDF — malware analysis report

Static analysis result for SHA-256 b919d9f883aa47f3…

MALICIOUS

PDF

18.4 KB Created: 2019-04-30 02:44:20 +01:00 Authoring application: mPDF 5.7 First seen: 2021-10-23
MD5: 489b3a035de8a2d0a80835b961334c2c SHA-1: 1a62adf3b610fc4ae4e22360c4da700bff6ae23c SHA-256: b919d9f883aa47f38ff91df39f46983d91b1419524c9453ea47e64c4b9b7fdcc
92 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, which is a common tactic for SEO manipulation or distributing malicious content. While the ML classifier flagged this as malicious, the specific intent of the links is unclear as they point to benign-looking book titles. No scripts were extracted from this sample, limiting further analysis of its execution behavior. The primary attack pattern observed is the mass distribution of external links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://loaminoo.linkpc.net/4095097095097097/School-For-Spirits-A-Dead-Girl-and-a-Samurai-Spirit-School-Book-1-by-Aron-Lewes.pdf In PDF document text
    • http://loaminoo.linkpc.net/3092095091099092/The-Head-Girl-of-the-Chalet-School-The-Chalet-School-4-by-Elinor-M-Brent-Dyer.pdfIn PDF document text
    • http://loaminoo.linkpc.net/3092094099091097/A-Future-Chalet-School-Girl-The-Chalet-School-51-by-Elinor-M-Brent-Dyer.pdfIn PDF document text
    • http://loaminoo.linkpc.net/2097096092094090/The-Head-Girl-of-the-Chalet-School-The-Chalet-School-4-by-Elinor-M-Brent-Dyer.pdfIn PDF document text
    • http://loaminoo.linkpc.net/2098099093094092/The-Darker-Ages-The-Complete-Series-by-Aron-Lewes.pdfIn PDF document text
    • http://loaminoo.linkpc.net/1099094093090098/School-Spirit-Day-Spirit-Week-3-by-Alshia-Moyez.pdfIn PDF document text
    • http://loaminoo.linkpc.net/1096096094091099/School-Spirit-Day-Spirit-Week-3-by-Alshia-Moyez.pdfIn PDF document text
    • http://loaminoo.linkpc.net/6091092097091/School-Spirits-by-Rachel-Hawkins.pdfIn PDF document text
    • http://loaminoo.linkpc.net/6097090093090098/Police-and-High-School-Girl-1-Police-and-High-School-Girl-1-by-Maki-Miyoshi.pdfIn PDF document text
    • http://loaminoo.linkpc.net/2095091092090094/School-Spirit-1989-by-X.pdfIn PDF document text
    • http://loaminoo.linkpc.net/3096095098094097/In-the-School-of-the-Holy-Spirit-by-Jacques-Philippe.pdfIn PDF document text
    • http://loaminoo.linkpc.net/6094091093090/Middle-School-The-Worst-Years-of-My-Life-Midde-School-1-by-James-Patterson.pdfIn PDF document text
    • http://loaminoo.linkpc.net/2090096098092092/School-Choice-How-Parents-Negotiate-the-New-School-Market-in-Australia-by-Craig-Campbell.pdfIn PDF document text
    • http://loaminoo.linkpc.net/1090099091094090090/The-Starting-School-Survival-Guide-Everything-You-Need-to-Know-When-Your-Child-Starts-School-by-Sarah-Ebner.pdfIn PDF document text
    • http://loaminoo.linkpc.net/1090091090094097097/The-New-Laws-of-Mommyhood-amp-Marriage-From-a-New-School-Mom-with-an-Old-School-Hustle-by-Dr-Anila-Ricks-Cord.pdfIn PDF document text
    • http://loaminoo.linkpc.net/8093092099098093/Horace-s-School-Redesigning-the-American-High-School-by-Theodore-R-Sizer.pdfIn PDF document text
    • http://loaminoo.linkpc.net/5090094092099099/The-School-Within-Us-The-Creation-of-an-Innovative-Public-School-by-James-Nehring.pdfIn PDF document text
    • http://loaminoo.linkpc.net/5090093099096091/Please-Don-t-Tell-Mum-that-I-Have-Become-a-Government-School-Teacher---She-Thinks-I-m-Still-at-Law-School-by-Hugh-Bachmann.pdfIn PDF document text
    • http://loaminoo.linkpc.net/4095099098095098/Read-Me-at-School-A-Poem-About-School-for-Every-Day-of-the-Year-by-Gaby-Morgan.pdfIn PDF document text
    • http://loaminoo.linkpc.net/5090090094095097/The-Luckiest-Girl-in-the-School-by-Angela-Brazil.pdfIn PDF document text

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