Malicious PDF — malware analysis report

Static analysis result for SHA-256 17764662edf7fd5d…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 18:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 247f08410fde966429753543af7bc8ee SHA-1: 0e53e502f8b0eb411158a37661dc88523de1d5d0 SHA-256: 17764662edf7fd5d72d420926f18912cdfe41fe529912d45e1f5ab02bc82108a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, many of which appear to be part of link farms, strongly suggests this PDF is used to redirect users to potentially harmful sites. The embedded JavaScript likely facilitates this redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://catamma.ru/uplcv?utm_term=st+thomas+anglican PDF link annotation
    • https://emenu.hu/editor_up/99090918011.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9f13e6a9fc290f27b90f4958cf58fc02/36799787361.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/2664900113.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/winewov.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8e9d93317920c115185f65f4ec10759c/vonolofizixivajujet.pdfIn PDF document text
    • http://bakoca.hu/files/file/181974230.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/vozekixukivefawowodexijof.pdfIn PDF document text
    • https://panama4d.com/contents/files/11623095121.pdfIn PDF document text
    • https://dptech.vn/uploads/files/kovog.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/11924358340.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/61188788893.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/61656349081.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gigepepiguxekazapotuluw.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/wazijoluwo.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/menunuvudibebexagatanev.pdfIn PDF document text
    • http://geodez.com/pliki/file/95832712848.pdfIn PDF document text
    • http://meskerjager.nl/media/files/gujube.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/raridadamabisobojufosar.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/55622107567.pdfIn PDF document text
    • https://advik.net/userfiles/file/8658606278.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/56855379634.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/morufefedokinaxuzisexodaj.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/mudizovojeritujofo.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/vuzaxivogibozuzu.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://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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 10520 bytes
SHA-256: f182f805b170dfdd3a2f05b653898b60bab7c55eb2ed8b7d38239292254bd922
font_01_sfnt_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 14532 bytes
SHA-256: 5330c58a048b0092cb952d4ccb0d26dbb9da1bdff450fb4f3024e055356ae795
font_02_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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