Malicious PDF — malware analysis report

Static analysis result for SHA-256 017c69593e31f56c…

MALICIOUS

PDF

75.1 KB Created: 2021-10-05 13:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7311e0956b09a6612cc167aa5f9c7753 SHA-1: b359240760756eb9188d979c3421e98eaba0c4e3 SHA-256: 017c69593e31f56ccbefa3280acbe1b853a3d9d3e695786ae4674e5596f9ab14
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF also contains numerous external URIs, including a link farm heuristic, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely redirects the user to one of these external URLs.

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://chcial.ru/uplcv?utm_term=closed+system+vs+open+system+organizations
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/nixapusixovigu.pdf
    • http://tokyosushilohaus.com/uploads/files/30259104181.pdf
    • http://kroonzuivel.nl/ckfinder/userfiles/files/71013146421.pdf
    • https://neurondevelopment.org/userfiles/file/livokuxeridex.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zelaludekamunomoveragisa.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1a621a828d5f9ce6a8ff0c52e5b2fce7/29385614955.pdf
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/basananagapenokur.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/de5d3f143d9b024fe3f46a5335b0a09c/444028863.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/betiviz.pdf
    • http://csc010.com/userfiles/file/20210923042224_b0hgkz.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/98803341513.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/dikusafixinelemodolesuva.pdf
    • https://xtrafitcoaching.com/www/images/files/mozuwatufapolas.pdf
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/50059140480.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/nugerawiron.pdf
    • http://epoch-making.jp/js/upload/files/pewiwowatujutafedo.pdf
    • https://anandamsanyal.com/userfiles/file/xovowabegoxotonubep.pdf
    • https://bor-diing.com/upload/files/timekejusulo.pdf
    • http://hum-lucknow.org/test/fckeditor/file/78781123600.pdf
    • http://udmvdpo.ru/images/files/jumolasonanozesagoxiraj.pdf
    • http://yildizteknikelektrik.net/resimler/files/55508381678.pdf
    • http://vattucongtrinh.com/userfiles/file/74299573167.pdf
    • http://tydafa.com/dafa/uploadfiles/20210904061912.pdf
    • https://tiemhoamo.com/data/dulieu/files/sanamajekonozuraniri.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_off0000c26e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC26E 16792 bytes
font_01_sfnt_off0000da85.bin
011cb3ff79d350d13e10738dd576f8a4389a8799f12eb96e0051476c6ccade19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 11004 bytes
font_02_sfnt_off0000f3f2.bin
e1525e5d74fdbad713754d951684d330e5fba7d6fa2dc0cebd05f4c763b371ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 16628 bytes

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