Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4655983498f56e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 08:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dfb95000e5a5f6ef88526259beb2ff5 SHA-1: 18ee1bb0dc9c98d5b08982f6982f073696cdb48f SHA-256: 9d4655983498f56e8f82e8410f5835a93dceb584c5e04674295ce5910a100707
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=david+brent+life+on+the+road+stream PDF link annotation
    • https://comptables-publics.fr/userfiles/file/wekoxepakijokara.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///53926725420.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kibabemazobefixirujokopi.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/99133199300.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/67163832651.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/redotub.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/p8avurtc1tilckgfvtthod1ub5/degolejexa.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/20751408219.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/lexulotufuwomopo.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/kogisipulukonemopu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/26794693196.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/silelisejokuwiparepij.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409bd79915f---nodinad.pdfIn PDF document text
    • http://venkateshservices.com/uploads/pijeg.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/70617630759.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fiwix.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/doregutilax.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/78200224614.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/98899572823.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/faxinelejud.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/ninijumiginon.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/28381257672.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_off0000c162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC162 17540 bytes
SHA-256: 29ce80e7e1eb4849d40e1e4c9945bff5287bd5c743513706b9963ae963932286
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10828 bytes
SHA-256: bc9aa9fcd67845961f997caf3c5dc86aff00874967281dce45729b22f7dcad20
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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