Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49fe25d578494fa…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 09:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbf092af639a28110024858f40bf7803 SHA-1: 0418107f9126d2a86c612f8c0ed9b7dd70ee5b6e SHA-256: d49fe25d578494fa2adad7cbca34ea4fdbb88d83f7b2e5db479a339c19bf3c61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate software. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kawanmto.info/contents/files/53813806104.pdf In PDF document text
    • http://drxzhang.com/userfiles/file/2536708587.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/jajaserasorufuvijaviragek.pdfIn PDF document text
    • http://capri.lt/userfiles/files/wetufojabizefeko.pdfIn PDF document text
    • https://ms02bet.net/contents/files/76929972074.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/84269223726.pdfIn PDF document text
    • https://loyd.rs/images/file/48661059017.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/guzomifojijelasaxikovar.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/5220253738.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/50659521868.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/39068673000.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/natibufikukikejezujerok.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/420f469b1e5a84381b98f900df0a430d/firorofeseg.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/17448148400.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/xidenaziderudifojulogadem.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/rapegowalegekilomejeru.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/44318100508.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/060133582765.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/kozamobuliruguduxulexemop.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/zikeloxakil.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/38097125830.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/76205100023.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/47167764665.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/93147aa7b5a7573ce88c52fd213277ee/lujux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vsdc+free+video+editor+download+for+pc+windows+7PDF 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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 10784 bytes
SHA-256: 810db3d4b64a536d15893aa42a3d9b69581267b55b611682ac473277eb62d2a9
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 17120 bytes
SHA-256: 75855d96cfea0e9a542b32a237b3f08e8b98e4694b1bca04192cb4dcfe1b2e65
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1