Malicious PDF — malware analysis report

Static analysis result for SHA-256 96acb32b77791206…

MALICIOUS

PDF

77.6 KB Created: 2021-05-03 03:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1327e61ca08c7aa309d65c3d4e7d966d SHA-1: a6bc83158e9a1f2baf83fa481c0b23866d1ddbe8 SHA-256: 96acb32b7779120685b469e38d91a864cfa73747bd251d8a0c8ec9e2e6543635
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs further supports this. While no scripts were explicitly extracted, the PDF structure and URI heuristics suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://zajinet.ru/strik?utm_term=behringer+xenyx+1002b+premium+10-input+2-bus+mixer
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/1448537.pdf
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5febce121ebdc.pdf
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdf
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/kafikodigiperupok.pdf
    • http://wutugidejavazu.scienceontheweb.net/96130197938.pdf
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/4281483.pdf
    • https://zazozoke.weebly.com/uploads/1/3/0/7/130776388/zinagazawagogu-xobuk.pdf
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/246e893.pdf
    • http://kidufamipowanot.mywebcommunity.org/australian_catholic_church_history_timeline.pdf
    • https://static.s123-cdn-static.com/uploads/4421472/normal_6008a9d1717df.pdf
    • https://static.s123-cdn-static.com/uploads/4454545/normal_6005f64b6859f.pdf
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/gijatefesofezat_mewezugogivuzuj.pdf
    • http://vogudikomi.getenjoyment.net/what_is_assistant_general_manager_job_description.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nozulabagewena.epizy.com/wupufowisipuzuweze.pdf
    • http://nugafafekovad.epizy.com/50516316256.pdf
    • http://rowulevuxiboniv.epizy.com/mezulizi.pdf
    • http://xetubuvij.rf.gd/borawesezetotag.pdf
    • http://woxanegerofokox.rf.gd/19580352846.pdf
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_305cc2b3f575431eb750a6d1dd46e21a.pdf?index=true
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_8776e8a2b7554c6faea6bae82cbd4d8c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb7.bin
906faadab000736198f9521319211acbbd39ad8569689239a576583a07fa7aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5708 bytes
font_01_sfnt_off0001011c.bin
a6962f8f1e52c9646dbb1f9c86311e8cfca83b367e431ef074fb37c5c5ccc71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 11788 bytes

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