Malicious PDF — malware analysis report

Static analysis result for SHA-256 790b6364368d6b3d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 08:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94b5c4ae23c69029806b4fffd88c2b2b SHA-1: 31f8c8869097da8f2a422ca48a8d2638a648c584 SHA-256: 790b6364368d6b3db115f7c2e0652ff90603d25de17abb5d54c6600042c38bd6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous external URIs, many of which appear to be link farms or disposable hosting, suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=campbell+biology+in+focus+3rd+edition+free+pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109171004181785.pdf
    • http://alacarte-design.de/userfiles/file/17976757281.pdf
    • http://benevolo.it/userfiles/files/xupaj.pdf
    • https://avphunter.ro/ckfinder/userfiles/files/34338600852.pdf
    • http://ateliergermain.net/sites/default/files/file/5361323672.pdf
    • http://yh-nutri.com/filespath/files/20210906080719.pdf
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/38004363422.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac91eed3f---89124293276.pdf
    • http://lutechmed.com/Images_upload/files/piponofofavidogix.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/22964194847.pdf
    • https://chupwo.com/editor_upload/file/51115739983.pdf
    • http://jucal.es/images/file/77234669008.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/mupugogitakejasugewaxiguf.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/nurowafogivilejelukubes.pdf
    • http://serextion2006.com/js/upload/files/75735126083.pdf
    • http://tnmetalworks.com/images/files/romizefoz.pdf
    • http://wakabaeducation.com/userfiles/file/51451134884.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139283e12caa.pdf
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210916041258.pdf
    • https://matricula.arendic.cl/files/73940106738.pdf
    • https://wonwon.taipei/photo/file/boxetarozemifenilafad.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/88083907502.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_off0000d0c4.bin
09846c7b4ee35f0c7181a03f2a3a1ede4e1f53a1b1d1f5570b559e25196f4d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 11520 bytes
font_01_sfnt_off0000ebaf.bin
e97fe4559784e61dde1a46b83412d46e64bcea996d1f58dbcf5ae553bd0bba2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 18176 bytes
font_02_sfnt_off00011b1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 16792 bytes

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