Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d20aaeeaeaf214…

MALICIOUS

PDF

77.3 KB Created: 2021-10-12 05:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 893cec50d0b5e74bc1920268ad926bed SHA-1: dfa0dad48925988bdfee91e4746b222e96401038 SHA-256: 05d20aaeeaeaf2140bb9ed34e42a3f97aa7677cf6179b46512c91769a8617a07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The sample also exhibits characteristics of a link farm, with numerous distinct hosts pointing to PDF files, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://santamariamikado.com/uploads/files/nuvim.pdf In PDF document text
    • http://www.sczct.com/up_files/file/45021577669.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/33619349969.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/zidowinofanazapeboka.pdfIn PDF document text
    • http://3sdent.com/upload/files/kejekijin.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mitasividuxugenugijije.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/72529218696.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/puvetik.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/fikodugegozogaguvozil.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/wukuvumojijovivizod.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/70080422396.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/vupifupunefagaduvurasox.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/1596354834.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1615573a17a9a6---pinusisopibekufatagoko.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/lugijobesezodofupigiraweb.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16151b1576a7bf---76646719609.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/62259723011.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/8695302719.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/29689301489.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/dadatezo.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/godifiredeke.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/72730229106.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/gogopugapezosajulak.pdfIn PDF document text
    • http://odumakus.com/uploads/files/82743638440.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/wodilesalepagelusado.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=the+product+of+two+irrational+numbers+is+a+rational+numberPDF link annotation
    • 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_off0000c68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 11172 bytes
SHA-256: 592c7ffef54691d2441db06497dee25ce4362d6dbbe06f85030d3691f403e87a
font_02_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 17808 bytes
SHA-256: 4de7580972f06010ae85351050186b281b10c7205092e57570cdc8842c119047