Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbdff833ff499fa…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 05:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0c6a31be89f39a5470af5215b88065c SHA-1: 2ce70c952a24dbfbc4d8ca262ab8a40ccecd9db8 SHA-256: 2bbdff833ff499fab31827721e5432803af6293b54494d8bda9778a869fe2771
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://helder-effect.nl/userfiles/file/sozaziwuvakawamijolema.pdf In PDF document text
    • https://somogyplusz.hu/files/letukaxebedajudikogobi.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/jorufejofatazalunom.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///37594004649.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210904165239.pdfIn PDF document text
    • http://eventechsite.com/files/files/ruribubarupavigekavadaj.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/76672109134.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/zuzowasubonojizibut.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433e686687a---25743108118.pdfIn PDF document text
    • https://ayurmitra.com/files/file/1649008926.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/44891640953.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/junategekexilej.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/81829345784.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/86509946394.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210904_EA84A829F2AFC560.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/70164727653.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/moridimidafunuzopogimib.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/16391693042.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/28545420125.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/xuwir.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/wozewobanumitinekowake.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350d559fb15---1395117565.pdfIn PDF document text
    • http://nincity.de/inline/file/vexutelobokowogojabopej.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zewoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=google+sync+phone+contacts+for+androidPDF 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_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 17924 bytes
SHA-256: 54d93ab78e8b62276440fead6c571930a03345a81337d6909ef88329c847b237
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 11052 bytes
SHA-256: 810f1f48575345fd20b3a35b4b89d5404207f514d8adfd8e27917d82cb0aec48