Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb2f832ce6cffe8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 02:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d2e2363572819ee78e19b24b0792753 SHA-1: 8a6c7296c42cc47aa238f942296ac292170fd25c SHA-256: cdb2f832ce6cffe818770c935f6de3854f1683ebecb053d8195ea5952443f237
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=all+beyblade+burst+qr+codes PDF link annotation
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/wuwawusexekafalidejap.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/pizujiwiniforafedijopudu.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/fubuk.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/63493865955.pdfIn PDF document text
    • https://durimawar.com/contents/files/didunog.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/wurufefalurexokikizade.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/21682345517.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/4608228691.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/nitebalovolozudadatowul.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/pawajuluweluniwofezoj.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/xilanebop.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/zumutujakoje.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/sitajurefumusirote.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/38561341496.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/22919434223.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/67441337623.pdfIn PDF document text
    • http://jsdarvin.com/files/2361918409.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/pixudakerumefuxejoxufa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140de1bb1c6b---66045552032.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zujipexa.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512cae5a14a---27448814357.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/kumud.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/sakek.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_off0000b164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB164 15660 bytes
SHA-256: 09c717a30ba2516dbd4294a602d5281200b18a45c9d84a170113a85801cfe2eb
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10648 bytes
SHA-256: 56cc5352b8a62244a7ef87effa662a278a2b61968a950339e3f5dec415587609
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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