Malicious PDF — malware analysis report

Static analysis result for SHA-256 441fa95aa29b9415…

MALICIOUS

PDF

68.3 KB Created: 2021-10-02 15:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c22c821819df79060976008e9699da2 SHA-1: 3559d9246fb4ef31215ce0ed76bb7c096900b006 SHA-256: 441fa95aa29b94155f826d45919bac607a09e90c37b58e0a83bc42abdb7507b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://irlanc.ru/uplcv?utm_term=fore+abbey+westmeath PDF link annotation
    • http://labuchedeberce.fr/userfiles/file/25403944077.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/fedilelitoximegiwit.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zavulawunusu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/kamidawe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908230452852.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/97228748763.pdfIn PDF document text
    • http://lulanjina.net/upload/files/81787506895.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/rejarim.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/gibapatines.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/labaluvurokurokazawevuxi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/durenugizumi.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/4224541839.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/47989405990.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/zalizuxepolawexadezire.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161532690a81c3---58342144416.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xokikus.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/sigutevovenogigum.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/dikegazudepeluputuf.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/46665276375.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/9736019965.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/xikinotobapekajodigedu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/zoximirupezuxi.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/kazinezikide.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_off0000ad81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD81 15120 bytes
SHA-256: 294d49b4620fdcae4864faddbb4ae44d02ffef7aab926a3dc96ade6daf4bb67a
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 10448 bytes
SHA-256: 3647a75cfc37e58db84e8919d2b2228b3987d89fce795cba7c1e7e4e939fe3b2
font_02_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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