Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fa3d716a65e626…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 12:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d508d59051eb05f864a719fbf0d03721 SHA-1: c19b552743c9bf403db3b97a696fba71c05ae34b SHA-256: 69fa3d716a65e626ad00403e2ab6066bbbafb130cc65112db055bd9f66b6911b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://crewmak.ru/uplcv?utm_term=convert+degree+into+radian+formula PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133648dd8b3c---57023287624.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/sexuwuzilusezidevoral.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xodovabuwebidewow.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/32926132992.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/3339674799.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/momofalovusenab.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/55994792973.pdfIn PDF document text
    • https://best-label.com/upload/files/42364225810.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/53468594449.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/37095613016.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/vorowiwe.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210912/file/1631424384.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/13b742fe23cb0e815bf5daf2efd2c6ad/dokubamokuxasoruvazuruv.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081719482214.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/tajugizixetaxez.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/31725767867.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/95675360548.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/nidadevorikuvubewiximema.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/pejuj.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/2021911542593659.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/valotimiwiburokog.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/jubugevupedinajupij.pdfIn PDF document text
    • 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_off0000b9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EC 17116 bytes
SHA-256: a1bbf9211d46b9c64b87ea0c1b369a11b1597d630bc4d1d29138cea87d150ee9
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10724 bytes
SHA-256: 48ac3123705c4318a2c8730eb1dea95a9d137481493524722b68f776c05de8d9
font_02_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1