Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1c5dc64e0c19d4…

MALICIOUS

PDF

69.4 KB Created: 2021-10-09 23:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76da613d6248c6f3f8e352e7d67d124c SHA-1: 6f2f6f4a08b775400b86c15933ec974a083b0c63 SHA-256: fb1c5dc64e0c19d44d4be324f5b3ff5f4e1e7a6e46c9451c3afffcce0c75851b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and external links suggest an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=java+for+data+science+pdf PDF link annotation
    • http://heatexchangersolution.com/upload_fck/file/2021-10-5/20211005093148495131.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/70883134279.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/92191951824.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dofudikizififekowobax.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/14414996770.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/94929195146.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/16762851795.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/247128413.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/99527950137.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210920055613_1806389674.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a9f2e837d2---dedomonekasago.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/28589486114.pdfIn PDF document text
    • https://pecsikult.hu/files/file/92776710264.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kulevapakekajirotip.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jisidumimevanonupe.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210913235501.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/regigimo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/86io8krd024968ua8brgnjeba5/jodasijuzawuje.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630465161.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/2432991084.pdfIn PDF document text
    • http://dominant.name/userfiles/file/kukuwanuzenukan.pdfIn PDF document text
    • https://ntc-container.com/upload/files/jakizufonamum.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/30370980697.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/sazisebadilana.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_off0000b28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 14768 bytes
SHA-256: 3ca81bedbae21466cf3db55b7b4d3e2b7e6da93db41eb095e6210433b73adefe
font_02_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 10624 bytes
SHA-256: 0b8d98ed2190d9791721739c86f00012b4d4512e843fb891403d734a112a430a

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