Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb22d8bc6c42e36…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 15:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45833cdd908346789d072be16860dd40 SHA-1: f3ff921e31f2939672c42b39d9edde034d005439 SHA-256: ccb22d8bc6c42e364125670fffd8e6ee7d308b3f9d925074bb7f39d7dc5524cc
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, including one pointing to 'smidgel.ru', indicates an attempt to lead the user to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=rebirth+online+apk PDF link annotation
    • http://aorganboys.handyfriendship.com/upload/files/gijidupopuwebotiloganip.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/razuzurakuzoni.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/38995125976.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1830796326.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c75aef342862661e8fcdd0a005ada21b/23378801885.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/46850078906.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/kazinivofekoxat.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210912/file/bomelevarujura.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o3664cd9huikvon5nkv8iig8e0/ruwazegaxeduwegoze.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/ganewenovavo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/dunokojizuzupadap.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/10887582302.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/5659255787.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60809507994.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/24664277593.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fukewoxuwesupaluzawanog.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/pexawebasobofasufuk.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/63240266056.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/36679009978.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/9847184212.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/rozonojilur.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/73018217453.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_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 18428 bytes
SHA-256: 5f46953ab230a9f6aa2af99ff327d5d806da932a913d642298115b54c81fad7d
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10456 bytes
SHA-256: 096f8333f928a24fd943c0cae3d9cb6e5a86900559c017b2e669ace56a748a7a