Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e636693662ac5a0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 13:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22b2ec0d63a69c8b0237887b13517a7e SHA-1: cb96a20b6344ce2e4703ecf969aee7bfc260c8d5 SHA-256: 6e636693662ac5a005dd158892e883b9071bf5798eddd9a09b937a93c5bffc6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://exdebt.bg/userfiles/file/28071350039.pdf In PDF document text
    • https://hamayeshniroo.com/shop/file/wepanexemuferolemimanave.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lejojesisolomobiwovekulil.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/18582429017.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/65180149573.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/dunulizigixer.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210901_162335.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb639a1ae4---71600170587.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/14391460341.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/dekubasefakadif.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/waxakutulovakavikonefuze.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405af87ddb8---mapowigon.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/jibimabijepusavepodawo.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/gemexakusoxulojon.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/nepotibitoxobenomuji.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/39314342792.pdfIn PDF document text
    • http://skolky.info/foto/images/file/50132723093.pdfIn PDF document text
    • https://argumentua.com/i/file/lidemewupakibogopox.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/xerelokulegev.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/vejiburevoxisima.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/40653377664.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/jidavimuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+run+obb+filePDF 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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 17580 bytes
SHA-256: ac4dc3bff3b4b55829dfe6e1d7b5fc5d68ac88ee79bdc5e3f71844794beccb1e
font_02_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 10196 bytes
SHA-256: 53a2d3f5f0aee0d7482bed4802439201c0f9af3e20c673added3c52b12a7d7c4

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