Malicious PDF — malware analysis report

Static analysis result for SHA-256 20876ef2598d3dda…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 02:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e363c49ae1f468038c0e558910d8274b SHA-1: 6dcd3a14b8a0f57ccafdfb55e2aab138644bee26 SHA-256: 20876ef2598d3ddade6c3a93fa7b12d1f2a38d36604bbbf6b0839b6d84928508
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using numerous disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=rocket+league+sideswipe+beta+download PDF link annotation
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6d3f1539f58b357aa1fc2cc7d51f5aa3/61034282109.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/saxizinafogakeseluloteg.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/dufalokoxoxano.pdfIn PDF document text
    • http://52963566.com/upload/file/202109030219508231.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/tewusepoboj.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/83288458702.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kapukemefedavup.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/80906554352.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m931vpkooht2u4ndt48g3pj6i2/3418619675.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/xepuw.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///45168635606.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/tiruzamomiminivu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/42306196471.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/52950417028.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/99625402884.pdfIn PDF document text
    • http://csp.hu/editor_up/80470164138.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wapinolisizozowi.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/97767231735.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/28301528324.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/jawulurojoneses.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/xibonolimarepitofipobop.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/tefikafokedigokezopu.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/katadosuwuwuwujexipalu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/tifukomakit.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/wixofulafozoraxonokew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 18708 bytes
SHA-256: 55e19df7dbc919b7de806a56729056a4d706dfa3db63ceb47153ba322212a8e8
font_01_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 11052 bytes
SHA-256: 2123c04ab16fe0ee5651ff0996153d195fbe7b24054285907005434c1c897cc3