Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee94c7fb5e348cac…

MALICIOUS

PDF

74.4 KB Created: 2021-10-04 15:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb41f7f99e79297a86f011a8c384f6c8 SHA-1: 5f0d8da102131374bc16066b42999a494b987bc0 SHA-256: ee94c7fb5e348cacfa8693f9617ca4de7820781c712db29150db7ccfa8b360b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded JavaScript, which is commonly used to execute malicious actions like redirecting users to phishing sites or downloading further payloads. The presence of numerous external URIs, many pointing to PDF files on various domains, suggests a link farm or distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=qualification+meaning+in+marathi
    • https://tramtron.vn/uploads/files/files/zajulepap.pdf
    • http://culfordequestriancentre.org/UserFiles/file/36717778618.pdf
    • http://henskeschildersbedrijf.nl/upload/63117319983.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/13349286441.pdf
    • https://limsurempat.com/contents/files/48644817361.pdf
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/vezaparoker.pdf
    • https://vongtaytramhuong.vn/upload/files/85149742082.pdf
    • https://valve-toho.com/userfiles/file/pepoxadawadusex.pdf
    • http://video-cycling.de/files/file/83857438343.pdf
    • http://kbidc.kr/upload/editor/file/1632335664.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f057d99b18---7693169178.pdf
    • http://studiocalderini.it/userfiles/files/wesawomamiwidosanur.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/rivukar.pdf
    • http://filipdegreef.be/uploads/files/retalemitepom.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/79113403818.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/31937375533.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/27403985549.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b842512536---xamisejovaku.pdf
    • http://kesherisrael.com/uploadEditor/files/jewudut.pdf
    • https://jooli.ru/ckfinder/userfiles/files/53597268951.pdf
    • http://agppi99.pretty-match.com/upload/files/20827477470.pdf
    • http://kxqcgs.com/filespath/files/20210926180746.pdf
    • http://remobudostol.pl/pliki/nodedodezoronululudeti.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/23861200902.pdf
    • http://rbmtechnik.pl/userfiles/file/poliwaj.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/patiwuru.pdf
    • http://csp.hu/editor_up/wilezodexemobopaxobakase.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_off0000b75b.bin
f10ee7653e1796789c2298c42b463e4eb84fa9c8507ce4abbe77aa456d845b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 20628 bytes
font_01_sfnt_off0000eb1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 16792 bytes
font_02_sfnt_off00010331.bin
3ee32ca72cd198ada4b1948d7c4bb4f57595a0c1ef05a2cfbc16162c16d462fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10772 bytes

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