Malicious PDF — malware analysis report

Static analysis result for SHA-256 81de7cdbd5b4a31b…

MALICIOUS

PDF

22.7 KB Created: 2019-06-04 11:29:16 +01:00 Authoring application: mPDF 5.7 First seen: 2020-12-28
MD5: d03d798b3c7a6315ec45987c0ed17051 SHA-1: 43757115891a26d0eeabd0df3f7f7b4b0f0a8173 SHA-256: 81de7cdbd5b4a31b62fa7cc1ebb16129515f067450c00666932ff85deb1b74bb
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, forming a link farm that directs users to external PDF documents. This behavior is indicative of a SEO poisoning or link farm attack, likely intended to drive traffic or potentially host malicious content disguised as legitimate documents. No scripts were extracted, and the ML classifier strongly flagged the document as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/6731731735733733/The-Feminist-Companion-to-Literature-in-English-Woman-Writers-from-the-Middle-Ages-to-the-Present-by-Virginia-Blain.pdf In PDF document text
    • http://cefasfese.4pu.com/2735738730733730/The-Creation-of-Feminist-Consciousness-From-the-Middle-Ages-to-Eighteen-Seventy-by-Gerda-Lerner.pdfIn PDF document text
    • http://cefasfese.4pu.com/8731739734733/Western-Attitudes-toward-Death-From-the-Middle-Ages-to-the-Present-by-Philippe-Ari-s.pdfIn PDF document text
    • http://cefasfese.4pu.com/1731736738737734737/Feeding-Mars-Logistics-In-Western-Warfare-From-The-Middle-Ages-To-The-Present-by-John-A-Lynn.pdfIn PDF document text
    • http://cefasfese.4pu.com/6731738739739735/The-Troubadours-A-History-of-Provencal-Life-and-Literature-in-the-Middle-Ages-by-Francis-Hueffer.pdfIn PDF document text
    • http://cefasfese.4pu.com/8730737735738739/The-Cambridge-Companion-to-English-Literature-1740-1830-by-Tom-Keymer.pdfIn PDF document text
    • http://cefasfese.4pu.com/2733732732736733/Lay-Piety-and-Religious-Discipline-in-Middle-English-Literature-by-Nicole-R-Rice.pdfIn PDF document text
    • http://cefasfese.4pu.com/3739735733736733/The-Mutable-Glass-Mirror-Imagery-in-Titles-and-Texts-of-the-Middle-Ages-and-English-Renaissance-by-Herbert-Grabes.pdfIn PDF document text
    • http://cefasfese.4pu.com/7736733737739739/Les-Universites-Francaises-Au-Moyen-Age-Education-and-Society-in-the-Middle-Ages-and-Renaissance-Vol-7-Education-and-Society-in-the-Middle-Ages-and-Renaissance-Vol-7-by-Jacques-Verger.pdfIn PDF document text
    • http://cefasfese.4pu.com/1735739732732736/The-Middle-Ages-by-A-R-Gurney.pdfIn PDF document text
    • http://cefasfese.4pu.com/4730730737732732/Women-in-the-Middle-Ages-by-Frances-Gies.pdfIn PDF document text
    • http://cefasfese.4pu.com/2738733739739732/The-Art-of-Cookery-in-the-Middle-Ages-by-Terence-Scully.pdfIn PDF document text
    • http://cefasfese.4pu.com/1733737738730738/The-Waning-of-the-Middle-Ages-by-Johan-Huizinga.pdfIn PDF document text
    • http://cefasfese.4pu.com/1736737734730738/The-Civilization-of-the-Middle-Ages-by-Norman-F-Cantor.pdfIn PDF document text
    • http://cefasfese.4pu.com/5732730730738737/Printing-the-Middle-Ages-by-Si-n-Echard.pdfIn PDF document text
    • http://cefasfese.4pu.com/1735731737731735/The-Peacock-Writers-Present-A-Spooky-Fall-Harvest-by-Alan-W-Place.pdfIn PDF document text
    • http://cefasfese.4pu.com/9733738739735731/Proceedings-of-the-Second-April-Conference-of-University-Teachers-of-English-Cracow-1981-April-23-29-Papers-in-English-and-American-Literature-Cul-by-Irena-Kaluza.pdfIn PDF document text
    • http://cefasfese.4pu.com/2730730734736734/The-Science-of-Mechanics-in-the-Middle-Ages-by-Marshall-Clagett.pdfIn PDF document text
    • http://cefasfese.4pu.com/5731736738736735/Magic-and-Impotence-in-the-Middle-Ages-by-Catherine-Rider.pdfIn PDF document text
    • http://cefasfese.4pu.com/3739736737739736/Epics-and-Romances-of-the-Middle-Ages-by-Wilhelm-W-gner.pdfIn PDF document text

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