Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f624a7e56b97f57…

MALICIOUS

PDF

76.5 KB Created: 2021-09-24 07:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6668f49cca7b1651a7d2c16ddd55f4b7 SHA-1: b5e6b107dd0fda9333f5638af6f7aa9460eb2237 SHA-256: 8f624a7e56b97f57c6d10d8646297bffc6de292a41c6626832908787a121ba5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=structure+of+algae PDF link annotation
    • https://9ja-bet.com/userfiles/file/tilusor.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/7302272861.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/42840724798.pdfIn PDF document text
    • http://wohingltd.com/userfiles/56492039050.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vivop.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wukivaxivodabalojemoves.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/romuvit.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9dc76bf2---xisamibeseviverubewajiro.pdfIn PDF document text
    • https://masteranalog.com/userfiles/file/90008629932.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/soxegojizaju.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/51946236309.pdfIn PDF document text
    • http://zenithmetals.com/files/12626488806.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d495a72bcbe2c98ae2486688c876a948/mikakifodojotufoset.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/mametigegajakijukovutonu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/72189756310.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/16921321396.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/32897790491.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/zosinafufezigoru.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/57012474822.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/83288652677.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/92154898223.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/29858310226.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_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 17480 bytes
SHA-256: aeca6581035571045caf6e3b9a28cb407ae1842df79f86fe3f6303c66f04b697
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 10320 bytes
SHA-256: cb8559028f9498b17d0ddeba5c790e6ac0814523214182d95f740c2817addadb
font_02_sfnt_off00010c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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