Malicious PDF — malware analysis report

Static analysis result for SHA-256 b910f542a90e8e67…

MALICIOUS

PDF

24.5 KB Created: 2019-05-05 16:19:18 +01:00 Authoring application: mPDF 5.7 First seen: 2021-10-23
MD5: 025746f04eb5172e1eb77f861befa4ab SHA-1: 31f9385e7247f4aacd7e8c08cd3abece96bfebe7 SHA-256: b910f542a90e8e6773be81989b48d2bbb8dd4488091dcdeb8a375d7a07730c66
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external PDF documents. While many of these URLs are marked as confirmed benign, the sheer volume and the nature of the heuristic suggest a potential attempt to manipulate search engine results or to host malicious content disguised as legitimate documents. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://muicuiu.dumb1.com/9a09a02a05a00a03/National-Audubon-Society-Field-Guide-to-California-Regional-Guide-Birds-Animals-Trees-Wildflowers-Insects-Weather-Nature-Pre-Serves-and-More-by-Peter-Alden.pdf In PDF document text
    • http://muicuiu.dumb1.com/8a01a02a02a08a04/National-Audubon-Society-Field-Guide-to-North-American-Wildflowers-Eastern-Region-by-National-Audubon-Society.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a01a00a00/National-Audubon-Society-First-Field-Guide-Insects-by-Christina-Wilsdon.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a02a05a02a08/National-Audubon-Society-Field-Guide-to-North-American-Trees--W-Western-Region-by-Elbert-L-Little.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a02a05a02/National-Audubon-Society-First-Field-Guide-Reptiles-by-John-L-Behler.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a02a00a06/National-Audubon-Society-Guide-to-Nature-Photography-by-Tim-Fitzharris.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a01a09a04/National-Audubon-Society-Field-Guide-to-North-American-Fossils-by-Ida-Thompson.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a02a03a03a09/The-Audubon-Society-Field-Guide-To-North-American-Birds-Eastern-Region-by-John-L-Bull.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a07a09a06a02/The-Audubon-Society-Field-Guide-to-North-American-Mushrooms-by-Gary-Lincoff.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a02a00a04/The-Audubon-Society-Field-Guide-to-North-American-Mammals-by-John-O-Whitaker.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a02a04a05/Audubon-Life-List-Journal-by-National-Audubon-Society.pdfIn PDF document text
    • http://muicuiu.dumb1.com/9a08a03a00a00a06/National-Geographic-Pocket-Guide-to-the-Weather-of-North-America-by-Jack-Williams.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a01a00a03/The-Audubon-Society-Encyclopedia-of-North-American-Birds-by-John-K-Terres.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a08a02a04a02/National-Audubon-Society-Birder-s-Handbook-by-Stephen-W-Kress.pdfIn PDF document text
    • http://muicuiu.dumb1.com/9a07a07a00a05a07/Birder-s-Handbook-A-Field-Guide-to-the-Natural-History-of-North-American-Birds-by-Paul-R-Ehrlich.pdfIn PDF document text
    • http://muicuiu.dumb1.com/3a04a01a08a05a02/Can-Poetry-Save-the-Earth-A-Field-Guide-to-Nature-Poems-by-John-Felstiner.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a03a05a06a05a08/Wild-Urban-Plants-of-the-Northeast-A-Field-Guide-by-Peter-del-Tredici.pdfIn PDF document text
    • http://muicuiu.dumb1.com/9a08a08a08a09a07/National-Geographic-Guide-to-America-s-Outdoors-Southwest-Nature-Adventures-in-Parks-Preserves-Forests-Wildlife-Refuges-Wildnerness-Areas-by-Mel-White.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a01a04a02a04a06/Subway-Surfers-The-Unofficial-Field-Guide-1-to-30-Quick-Upgrade-Guide-by-chen-xiaolong.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a00a04a04a02a00a08/Field-Guide-to-the-U-S-Economy-A-Compact-And-Irreverent-Guide-to-Ecnomic-Life-in-America-by-Jonathan-Teller-Elsberg.pdfIn PDF document text

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