Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729ecbb2adf3cb0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 18:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e9f4dfded45f7ccc8449c5e419aad59 SHA-1: a9984597fdfb908d3e610404102b5181bcc4f122 SHA-256: 1729ecbb2adf3cb04747130569b483137bbc114d060d0f2b3958efc6b3d506a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://studiodabo.eu/userfiles/files/11025385343.pdf In PDF document text
    • http://mallncart.com/userfiles/files/60168238902.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/kesoruditesajovagak.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/noxazexogesefejuz.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/44808531409.pdfIn PDF document text
    • https://grancom.by/upload/docs/12422979273.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/10893882451.pdfIn PDF document text
    • http://skupka23.ru/upload/m/69192738465.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/bivowetedupofo.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/17030578366.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/21857692704.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ede7960c1---nevinov.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fotimiro.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce3550418---76010631939.pdfIn PDF document text
    • http://teraval.cz/res/file/73813440297.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/20720208842.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/japetinadiwikazuzapi.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/78150581903.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/255568230.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109061635573617.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tisukaviwazagewigezogas.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/38097260200.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109060312117047.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/14605450348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+nougat+stock+wallpapersPDF 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_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 10948 bytes
SHA-256: 56b3e324912d27a1200983603b0410697873d400d7c70213e2d89e7ef0ce9c60
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 16864 bytes
SHA-256: 7b11b455f0655d7e9c5fbf6ded47b73c8293e70b7f5171aca89e46aeaab00d1b
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1