Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc95cd762ec92d2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 22:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 960e7eadca5f901da23e5b60003c1204 SHA-1: 14a28b719f5df768ce6a4f8e8fcd077566e82d36 SHA-256: 6bc95cd762ec92d24a9ae0246e18b5f672aed5fbe1fdd14d4a05fb35d542ad58
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pgp-puh.hr/fck_media/file/94479674100.pdf In PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/rusivufosebanoxawegux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130417aac633---naninasumopiduma.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906044357.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/bogetututipokoximuzu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/44669963745.pdfIn PDF document text
    • https://vitanov.rs/files/bofizajawolapuwekos.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowege.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/mubonelupu.pdfIn PDF document text
    • http://w-mill.jp/images/file/15355965899.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/sovijipanufobox.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/91707750236.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/34240605153.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/37034781755.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xagolaxipurosot.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/70432362183.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/41231718447.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/sepikejegu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mujifowudikavuk.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091708091573499.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/koderut.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/26396468178.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/46278698556.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613291b9e1a0a---sununufesowogexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=indian+movie+app+with+english+subtitlesPDF 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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 16980 bytes
SHA-256: 18ae010910d041d2112c88298176f1466ed449a1c7b2e41a7a85b02778c68aee
font_01_sfnt_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 11084 bytes
SHA-256: cae2825cf3240ac6490531469eef6dbbd9b7cde3bd127b936cd8ef994bf04206