Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c20fa554e7e4d5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 21:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a586c404c7fbbbfffebbab73d79ffab SHA-1: 493b8226e13be81701745394d811e78b178874a5 SHA-256: 53c20fa554e7e4d5318956442835c5785b26b315996cead5758f2a6673811940
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_JS heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=sanam+teri+kasam+full+movie+watch+online PDF link annotation
    • https://kampusogrenciyurdu.com/file/32828075356.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/51888412685.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/41091098300.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57354794472.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/87096121262.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/75261403324.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dibaguvelakikariwetogub.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zuvejep.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/gizenurogukozumudebor.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/40393224080.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/nototaj.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/ruxaxojuduvakolese.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/13390614742.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zisawosamop.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/tawinefukonapedosovafe.pdfPDF link annotation
    • http://www.gamylai.vn/uploads/files/kuzexef.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/49896643563.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/48831514743.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/54050843927.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/668rabavvetmp4r9b78tulo8c1/12263576955.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/mivubitaxipafibunovutunu.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/kedupuwegikudekeze.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/55817456026.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vibinutibasuxosoramunabil.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_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 11020 bytes
SHA-256: 2dece6da803990e53ce3c60f508ef90b651969e7b9310a675594c1d7a7197611
font_01_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 17424 bytes
SHA-256: 4d6e34923c0d7081adc6022fece3a8eac61436188ccd5eb42f8a13acbaeca6c0
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1