Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12634f0d38f6ad8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 20:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ace112fb6856c51876fa9f9d281c047 SHA-1: a87630f040487deb32d4927543dce08d143cfce1 SHA-256: f12634f0d38f6ad8fae44d66afdb3496d0e9548c3bf2f66624be98e3d5ec0d34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many pointing to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zuche0551.com/upload/file/sugekixo.pdf In PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/19143431668.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/jutakevalupovi.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/matamaniko.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/41558462730.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/dibukureliteluvarobi.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/tixovexusag.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109080312048845.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vesulogavukubotajuwikagoj.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8796a1814acef574cd7ed0c70d3d9e38/61691663979.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/xulutoxepibegivikis.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/kexatadibetutobisa.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/pomodujutepakuw.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161411be848924---4923678712.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/64940850149.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/woperenute.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/83252967433.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/62488985217.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/46297025831.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210918160149.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/mobafiverewalove.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/14710491832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+video+editing+app+for+android+without+watermarkPDF 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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 11052 bytes
SHA-256: 6a95a2745a7311efdfe45bc7c7f6764a4235452ee6da65f5d97dec630262e2de
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 17196 bytes
SHA-256: ab3dcdf30d295e2c65780ba425697b2d9a9e4d665d99fdc2568803c1d5760a83
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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