Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbd3f90eec16f59…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 09:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15399eed0ebd6191d7438ac305cb0915 SHA-1: 73142feb5c3b51205f6bfe41bad9921d763e7d75 SHA-256: 3cbd3f90eec16f594d63e905a9bfb42227e322c1601cc7ffdba613f798b72a92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The high number of external links, many pointing to PDF files on various domains, suggests a link farm designed to obscure the ultimate destination or to host multiple lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kham.vn/userfiles/file/8347699711.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/79168239278.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/zeludosanuxel.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/28477354525.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/67465084429.pdfIn PDF document text
    • http://newchat.xyz/js/ckfinder/userfiles/files/gewalub.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/newapesunopiro.pdfIn PDF document text
    • https://123natura.com/stockages/files/dabobunupepufoged.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/9407161.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/dokoxelaverup.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/kawugolajiburinizokin.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/wejolerazep.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/apc70lc4oo8jvhncip5v3i9a52/69535441170.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/latij.pdfIn PDF document text
    • http://bndweb.nl/upload/files/wenumutadobad.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/26350310817.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/16890119459.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/71475483922.pdfIn PDF document text
    • http://gtshotel.it/images/file/jatipet.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/moxodemajonaxaji.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/85364930660.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/38126773831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=poweramp+music+player+apk+full+version+free+downloadPDF 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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 11140 bytes
SHA-256: 011c163db6b131084d546e670720ce585985b698204c714b37420ac130a87ace
font_01_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 17664 bytes
SHA-256: 4425688d1f91e7f70f320a8e41eb1a2618b166f751d06c419673f222e2df411e
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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