Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76c4ef55730ec72…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 05:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5072cd736b23ab75d865c61f737ee238 SHA-1: 43dfd1877be8300ca102e5eb8984bc203c7b1e37 SHA-256: c76c4ef55730ec72be240fcb54a434e739b85387ee65bee5c83775b49560acff
134 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 within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to redirect users to numerous external URLs, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://investbuild.ru/var/upload/file/gimoguwim.pdf In PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/pamutujojew.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/degoreleme.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/busepewekogibinaxinaj.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/8919875168.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16133fee551db5---titazisogogulep.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/momukufebovefon.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/binopasasepizikozuko.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25834875957.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/dadafowu.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/tinakizora.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/likisofexezezunifax.pdfIn PDF document text
    • http://186086.com/upload/files/wozuwuxoradabevidenate.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210903122240170749m5e0xx6j38ho.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/bejetarom.pdfIn PDF document text
    • http://aminotp.com/upload/files/69481061512.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145c38d71e17---85977608163.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/97836286172.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kezuworifimuva.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322357d1ee3---suzemure.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/budugamakudoxirunewip.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109141153321765.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sejetikoguwubaw.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/33756259842.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/tekujasibimijasigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=my+ethiotel+apk+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_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 10508 bytes
SHA-256: 71fa9384aeec1ae466b313e6079cca7116213cabc6692695dbbca302e835d87a
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 17868 bytes
SHA-256: f6246d37efda4f15795e2f06a684d507cc59dc05cc8957992b450dba8d7effac
font_02_sfnt_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1