Malicious PDF — malware analysis report

Static analysis result for SHA-256 471949e561ccbdf3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 17:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61b335563dc5e44aad3baf17d3b1966e SHA-1: f698d0e4810bcefd64a5d39107c66a6fae45090b SHA-256: 471949e561ccbdf3d8ba8c4fe5114a91816b908de3fd83e836d4a63ee6610052
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and acting as a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ctyrkolky-gamax.cz/data/dokumenty/81878945988.pdf In PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/nenalisatixewimavud.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140a44de0f06---jitojilugos.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/57862934007.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/89076812282.pdfIn PDF document text
    • http://trovas.com/userimages/64402537216.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/11483605518.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b38945e14---80049599643.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/voveviwezepola.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62767465341.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/42090422451.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/82564526066.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/630b6f1d298fb8be086f8f6db74f5e06/83340279761.pdfIn PDF document text
    • http://labonscafe.com/userfiles/lotibukafi.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/19717171750.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/tetagovugu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/95667623684.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/somikefe.pdfIn PDF document text
    • http://youil.org/userData/board/file/fotudusijowedogujolazez.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/86152255496.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/23527745639.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/22635388657.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudezunamesofotuvenukuzo.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lojizape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=virtual+xposed+ggPDF 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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10636 bytes
SHA-256: aec0f97588701f79922090872a26af268468ea8cb11b4560a3e2ae46eb8e7b5d
font_01_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 21544 bytes
SHA-256: fd42277a4868f6c65a7449c797b8714d1ff983ac90d71a90f735d919c482f84b