Malicious PDF — malware analysis report

Static analysis result for SHA-256 307663fa330840ed…

MALICIOUS

PDF

98.1 KB Created: 2021-09-09 09:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b213a1f39761a5b3e7055a74908f9b24 SHA-1: ac2a9083e3a2c81fdc64ae9a933e64c23c3a3204 SHA-256: 307663fa330840ed2a57dcc23810f6a69d007dc462c798a8575d3f758400181b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found, such as 'https://nomylo.ru/uplcv?utm_term=gta+nds+rom', which are hosted on disposable domains and likely serve as phishing lures or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=gta+nds+rom PDF link annotation
    • http://connect-event.fr/ckfinder/userfiles/files/28975365579.pdfIn PDF document text
    • https://udruga-invalida.hr/files/86686976910.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/pajojij.pdfIn PDF document text
    • http://vinmexindia.com/uploads/19670878047.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/tusavejexowives.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/11493692516.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xugux.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/wonoduvuba.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/98839051848.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/dumafifaminez.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/54177601.pdfIn PDF document text
    • https://onecre.com/images/content/files/73319527253.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/34369509227.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/fajukup.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/didamiwok.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/44499430470.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/dexowovebemu.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/99610366949.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/jufir.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/71020122101.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/lawajapojitanure.pdfIn PDF document text
    • https://asi-filter.pl/files/file/tefopuxalodexenila.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/1794541014.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/benubevel.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/tebometorazelitafe.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_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10176 bytes
SHA-256: fdf0da74b1f2907bcada68493352c85ebb82635be3fa5cf0f681d2568f8be2ce
font_01_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14952 18736 bytes
SHA-256: e0cfec52af5103889516de46036a0d12d8fb00f551eefa8e4f7a4abdb5e80e5f