Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c9ae1638c2f889…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 20:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50dde73489666163a8af3826208b0081 SHA-1: ea2b534d062a4dca853a68f2556346070bf0ab83 SHA-256: 45c9ae1638c2f889cdc6c57bbfd318ca1af87afc44e190e7b37276e94e010e5f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a phishing site, as suggested by the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siroyensao.com/upload/files/76352414249.pdf In PDF document text
    • https://penzion-palice.cz/content/zuner.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/xujubovidodeludoraweba.pdfIn PDF document text
    • https://ahha.az/userfiles/file/16866186974.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071520251973499.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/gijobifumodojagobajopebur.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/tepedop.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/fetemupixuzoba.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizamogenisum.pdfIn PDF document text
    • http://imi.vc/upload/files/85596980163.pdfIn PDF document text
    • http://mousike.it/img_ins/files/nadosodurodabuvogalobipik.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/74721862785.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/88368808973.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/77852348552.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/13448850687.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9ul3773le6ed9smooklj8sqmbk/wowatuwiwapi.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/89282640969.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1c21eea44---porof.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210527040136758.pdfIn PDF document text
    • http://mariancozma.com/_user/file/66207105026.pdfIn PDF document text
    • http://parlagame.com/calisma2/files/uploads/mowipepimukofetok.pdfIn PDF document text
    • http://beijingteye.com/upload/files/10517371795.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/35878702305.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/19285900973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=crop+establishment+machinery+pdfPDF 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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 11172 bytes
SHA-256: 7fb6464b0e478f001c0e2f7aa0a3e33a5738832bda11c9588b84a6c89c5f484c
font_02_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16156 bytes
SHA-256: 145f8c68aff4cf33cccdbe1e5a43a62e35e5ebde1b7cf88d93a071c922fbb139

Open this report in the interactive analyzer, or submit your own file for analysis.