Malicious PDF — malware analysis report

Static analysis result for SHA-256 881a096fb048b40c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-21 06:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cbe008293f035a2fbcdab86c0e66ab3 SHA-1: f62e73a8f81dec6dd5542ecd35b106118d314407 SHA-256: 881a096fb048b40c7f3311c3b87e1838fc4df742e1e640d9f4876a3de7dbd7bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several external URLs are present, with one pointing to a raw IP address, suggesting an attempt to download a secondary payload or redirect the user to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hoteldanang.vn/uploads/images/files/37762026627.pdf In PDF document text
    • http://shyjjc.com/v15/Upload/file/2021911203225323.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/puwakogisivamoneki.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/21/telemutuxerudijifowejef.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/25621922412.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912191651.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/salesabuxuxow.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/5317594505.pdfIn PDF document text
    • https://durimawar.com/contents/files/67878244450.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/7843651817.pdfIn PDF document text
    • http://lblussana.it/images/file/lovopur.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gaxisigobugowufapulofek.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/36963824846.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/veserejojuvodaji.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/tutiwesaxu.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/kabaxaduzovodukawim.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/89073844089.pdfIn PDF document text
    • http://slsnn.ru/content/files/49447568798.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec240806d---fixemirimizinu.pdfPDF link annotation
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/padabakoxiwutuka.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/80455410861.pdfIn PDF document text
    • http://compsult.net/userfiles/file/defijukabevafagobewi.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210908_100934.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614847d8dc607---zasukakumolibixebiwetuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cual+es+la+mejor+app+de+limpieza+para+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_off0000c0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 18044 bytes
SHA-256: c11747b62860ba89393cf4a256a016d10935d6152ff79fd36e3288f8de527c1d
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 10776 bytes
SHA-256: 54919c424c1b861f2cad34bdf449655fd7a1fbcdcc0addb4b090c5d60041d37c