Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f10e1b3511f1ce8…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 18:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e68ef1f744d28e147ad3ade47de8ebc2 SHA-1: 75399c173ceab7c11a2da8084f3b5c760e8215e6 SHA-256: 7f10e1b3511f1ce81882317dff4b014b9da38f23643c0218f1a91a4aeb9ba775
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URLs, with a high ML classifier score and ClamAV detection indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious software by posing as a necessary browser update or plugin. The embedded JavaScript likely facilitates this process, potentially by downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e596a70b3---85374104531.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///58487414215.pdfIn PDF document text
    • https://braus.uz/images/shared/file/liveburidovujedojebiv.pdfIn PDF document text
    • http://wuchem.com/upload/files/27940454242.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/murixewutegeranese.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/melosupadetetidolumusog.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/sefapodikodupusam.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/42606843129.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/22477141094.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/mawutudomemuk.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/zumavekulitizutus.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/15047379862.pdfIn PDF document text
    • http://kustari.net/userfiles/file/budigik.pdfIn PDF document text
    • http://sql110.com/pic/76687304590.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/selokopugopotujipofu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/taxatewidep.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/49537466231.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/35663867850.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/vikejutibesutulo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7709df94---56697421636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pillow+thoughts+free+pdf+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_off0000bda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA5 10964 bytes
SHA-256: 7348113d11ff2ee36429c6b28c067b627af23cddc8518df920fdcfaf2930ddbc
font_01_sfnt_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 17176 bytes
SHA-256: 19bb89060bc0fdb4493152336b8d17bf976942b278c415f57c2cb85d337797b5
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1