Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50b1a25b015557f…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 15:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e18d048dd8f97e7cbffc15401f18cfcf SHA-1: 97795877e4e5cf688665b60bfa50fdf12f1ec822 SHA-256: f50b1a25b015557f6e9845898be52bba36244116aadd5b5a23ad39dcceea6fd8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. This JavaScript likely facilitates the redirection to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs. The purpose appears to be to host a large number of PDF files, potentially for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cezartravel.hu/userfiles/file/jotudasakawujulesobed.pdf In PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/12443388470.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6ff1b5fe970734fa3834f67e8b00971d/damobix.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/89059793386.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/19856888153.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/wasujovejopejexanorakilej.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/9458885993.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/30207425032.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/62771238184.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/surazisokibe.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/wuluzonuzike.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/30194094216.pdfIn PDF document text
    • http://vladekoservis.ru/files/37427517246.pdfIn PDF document text
    • https://andrejc.si/files/file/sutedije.pdfIn PDF document text
    • https://bor-diing.com/upload/files/taluvagojekixi.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/87384444308.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/jivawilebifulu.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/jofepuxupinubugupud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17caeb13d---susuvixazemotaxag.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/moxuvoro.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/mojajajenijefavul.pdfIn PDF document text
    • http://techbis.pl/files/file/fejinukukowutaxezubezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dr+driving+2+apk+mod+downloadPDF 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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 10700 bytes
SHA-256: c98fbc9db61f2e949ab3a06f0958c73ca2fabf8bf9101ea51a019aa70ad580ee
font_02_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16992 bytes
SHA-256: d1018a5afedf3cc77a4ad5a2a2d8f3b610b3d46272d7494ef56086bf42f442e3

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