Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1e481bd6f21303…

MALICIOUS

PDF

73.0 KB Created: 2021-09-09 17:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70b53ea17af8fe266f700469c7174054 SHA-1: 111f220ea6bee4b21ac7b00f049fd9dcfa06c65a SHA-256: ce1e481bd6f21303bd123534d24713e9fcbab36b4865369c159a9c319d7dc5cf
134 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 a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://funkyspa.net/ckfinder/userfiles/files/52113486631.pdf In PDF document text
    • http://metafelix.it/userfiles/files/majefoborebokopit.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/35065767352.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/mojepumozaz.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/60835394064.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/wemokurajoboxeg.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd22c99af---8962620986.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/68111502584.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/17175278506.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/49835750503.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/6727738922.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/wugijudaxezedowomerexiwup.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/salegoj.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/28873371759.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/64478761804.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/8208487993.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dawaxe.pdfIn PDF document text
    • http://jarosi.hu/files/file/ladigewawesaji.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mewexulur.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ce87254b---18857359092.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/19707747808.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/vabovamelolasadokikile.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/36562154623.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/47808665031.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/36612244545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=among+us+game+online+for+freePDF 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_off0000ba17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 10540 bytes
SHA-256: a7fcdd64b8d6944aa76ee4acbaf801bac0ac1119c8492cfd75be2c26a2543d81
font_01_sfnt_off0000d212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 17188 bytes
SHA-256: f31a67e5f3fa6f02d9f70b179e6049cb8c3db00b204690c053561726bbdf1a4e
font_02_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1