Malicious PDF — malware analysis report

Static analysis result for SHA-256 717d3645c66d9eb2…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 08:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e1a3f2981d9d98aa6576098bbcb13c0 SHA-1: 57f2408d1a38ee956b39c1d429d916fc770523d0 SHA-256: 717d3645c66d9eb21ce4de52f30811aed3b035865e6d970b348171475fed06da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. 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 0.9951

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://laborke.ru/uplcv?utm_term=pokemon+light+platinum+latest+version+download
    • http://klwas.org/userfiles/images/file/zekebimekuvapizapi.pdf
    • https://eklyps.net/images/file/dirideladeturopi.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614090509ddd6---28484690292.pdf
    • http://bellina.pl/userfiles/file/75759390644.pdf
    • http://fkjz.cn/upload/files/2021/09/202109141919172669.pdf
    • http://levant-tekstil.com/other_files/File/75124476837.pdf
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/lomukur.pdf
    • https://dichocungtoi.com/userfiles/file/71574239352.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/polaxulotagolifurexexujor.pdf
    • https://sporyolu.com/resimler/files/fifumupakepulon.pdf
    • https://democv.associasuite.com/imagenes/contenidos/files/26256308480.pdf
    • http://vncdata.net/app/webroot/uploads/files/53979853932.pdf
    • http://friulanamarmi.it/images/file/58218991422.pdf
    • http://theblare.com/image/upload/file/96955930311.pdf
    • http://haithuanphat.com/uploads/files/35309917271.pdf
    • http://oinfo.cz/userfiles/file/bumatezogegawubinu.pdf
    • http://hidropro.hu/upload/40383657005.pdf
    • https://fultoys.com/userfiles/sebux.pdf
    • http://hodinovysoused.cz/upload/file/24627844672.pdf
    • http://flairpens.ru/uploads/files/66817106934.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/20846385119.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/donupeninuvokeju.pdf
    • https://clubberia.com/js/ckfinder/userfiles/files/folizevu.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea70ee2cdf---pejopudavizivoramaxokufu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aebd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 16792 bytes
font_01_sfnt_off0000c6cf.bin
6048eb8aba0e72e14ad633e8733eb30e4c1ee1bc760980257e41e70b21027298		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 15140 bytes
font_02_sfnt_off0000ecee.bin
adc94e258eabb315bdb4508c37bb460a0ddc73b11ff2532004c1e0a4f86e0c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 11184 bytes

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