Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18fa2a8a3b5d744…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 09:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 181ee1c6871510d6dfa863d10b530008 SHA-1: 26f3ff26471cddd1f141b0a1456983cec38db3b8 SHA-256: b18fa2a8a3b5d7441475df885f0cbe34506033734c2127eec75c9a590793cd4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains hosting PDF files, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35739896237.pdf In PDF document text
    • http://divorce-difficile.fr/userfiles/file/jusavometobegijemi.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/81307644542.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/8718747985.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/jegex.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/8272755033.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/23990948238.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42470606375.pdfIn PDF document text
    • http://synphabase.ch/upload/file/18857326914.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/95460963609.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/fotukot.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/75425281705.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/88affaf643b098ed737fbfc70d49c8c1/danigujusavunavamazi.pdfIn PDF document text
    • http://laserinnsbruck.com/static/34560225313.pdfIn PDF document text
    • http://ropesadventure.com/d/files/65551945902.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/76959864028.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/63817559069.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/zozum.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/minugamif.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393eda3d6d4---57112538682.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/guxoworakoget.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/35648771479.pdfIn PDF document text
    • http://tochalco.com/uploads/files/65228853161.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/25711855863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wiki+encyclopedia+offline+freePDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 10548 bytes
SHA-256: ff6bbad4cf6e95034ef8977f46ea72c57b5a74ff35c45471fab7bfd10ec28048
font_01_sfnt_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 20936 bytes
SHA-256: a2cd1681e63d5e00fc376410f9e57bb588eb8c0af1039366d012dc63ebc8934d

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