Malicious PDF — malware analysis report

Static analysis result for SHA-256 e216497aed4ef133…

MALICIOUS

PDF

70.3 KB Created: 2021-10-10 06:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2b4856b89e1bcc673692904390e26bc SHA-1: 37e80bab35ac40cf3bf9b283aa69aa099b4c8184 SHA-256: e216497aed4ef133d58bf1a318223135a3584de3ed3764864a37cb95b74405e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=copy+a+table+from+pdf PDF link annotation
    • https://parc-hotel.info/file/24878356469.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/60701279260.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/siwoxulekinesoje.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/gesomelovuperogiju.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410a13c05a8---nefituziluvidoxonifu.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/79996541920.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/64812671085.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/6189643885.pdfIn PDF document text
    • http://gibisch.biz/files/files/fuvova.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/02d7173319b23bb957b763a606a556c3/94386949705.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/60917640034.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210913204940.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/29353204755.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/98624021585.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/60191790952.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/46667238034.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/61057286869.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/14007117788.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/bobemizovotixetiduf.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/fiturodawuduv.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/4731661946.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/49412171608.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/32858914284.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/jejizusub.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///zezetozasapapaxeva.pdfIn PDF document text
    • 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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 10580 bytes
SHA-256: 34afba4d85276088460f904ee479aa6e591a37b24ae4ed0c7ea98d1d076192ff
font_01_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 15264 bytes
SHA-256: 7f55c267fbf34f73ad3680f001f2ce9dc552198463a5adbc0515a82266258300