Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0abc4d44a20e4c9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 07:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6653d5fb7c7659f70eaf595fabd2703 SHA-1: 46284a8690763b8ad3fa1f3e63af6a1f09b33114 SHA-256: c0abc4d44a20e4c987f39742faa830184fc8d756c70cc13a22efb14aee2ed7ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a high confidence score. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable domains, suggesting a phishing or spam campaign. The embedded JavaScript likely redirects the user to one of the listed external URLs, which are themselves suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://nomylo.ru/uplcv?utm_term=kingroot+pc+download+2020 PDF link annotation
    • https://cmflower-kkc.com/ckfinder/userfiles/files/15347866463.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/pukifimuxedu.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/zisemeleburepuvovoboveze.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/minuzag.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/wezomexojuwigub.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/jurilabubipopixuza.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kikozomadaligavedako.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd88a2870---98780976994.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/86e74232f2dd31a033c00ed6bdc61668/gonuwoz.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/benijezame.pdfIn PDF document text
    • http://wirheiraten.de/images/file/jeburedawe.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/migapanokigibisapizeg.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/99377464468.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/serusodumopan.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/40970226470.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/lawafixoxitubiwude.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/60061923341.pdfIn PDF document text
    • https://maisonforville.be/documents/file/8653506997.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/4056372693.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/wupanared.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/kudafulosabagipis.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/82185580611.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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 17352 bytes
SHA-256: 89b8ccd9495d92d0731badacccb68931b5e7942c37df35f9de7b1c57229cd74d
font_02_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 10708 bytes
SHA-256: 997b0dc198cf5edc255d50e2ef85c92548756fd246192b1a311402fca89c3420

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