Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cd8b1b1797ea2d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 23:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f2c332942b281285fd781d39cb24bd6 SHA-1: cdbc3ba91e71092c11fbe3229036fe64c47ddbde SHA-256: 36cd8b1b1797ea2d56f7edb4adc41c166a3590a468c016af51b9dcd4769c125e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a scam. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=kernel+adiutor+apk+download PDF link annotation
    • https://m3nan973ru5-pa571.com/contents/files/75087004853.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/059s6k8o9v2k6o2o60195kvgj2/datoba.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/71878238080.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109101556208525.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/kugulisosurodoboxegeduv.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/luwifafusobojapigigodorix.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/wutofujunuwi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/55046810192.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jawegabad.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613370c440c26---sinaxefazumow.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/nitorujo.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/vogixaxesuxavip.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/91225475348.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/vositegugomut.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109101525366540.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/denedekitaju.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/86766462660.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/lajatatuwonikifugebekuj.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/vifejopadaxekanaloz.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/83059749463.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/sizegemiremubamago.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/11036475442.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/danorewezinowemi.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/kajiwoj.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/31478577258.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 23088 bytes
SHA-256: fefc142dc68140b39ec1786e9784ed277e674bb10c9fabcc239f9d8f5dd59b31
font_02_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 16064 bytes
SHA-256: f76835efc0f70b52b211676925d3c3919e6952eec6cd10f320d1ab287c5fabf2
font_03_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 10488 bytes
SHA-256: ba153bbbc47465b278dc67311273eff9549dd7607e38710291e32562bbc5dee0
font_04_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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