Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac864f3e0e8811…

MALICIOUS

PDF

71.3 KB Created: 2021-10-03 22:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ff02bd802f8a00ffc16829508fd38a34 SHA-1: a59e2baf025d66d1ac91bfc70f2b4751ad3aa54a SHA-256: 5bac864f3e0e88116f7d28f7ae945e63856510f58012c1b6111edf9cbdd1b3cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=what+is+even+function+and+odd+function+in+integration PDF link annotation
    • http://artemon.nl/userfiles/file/donitofos.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/35126680021.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/nejavenovaperomof.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/xiperumujaravukuxisokul.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/26614933983.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/15585992155.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/78340207962.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jh28nas9q8os35p78nvn0f8c3b/57243749724.pdfIn PDF document text
    • http://abworder.com/uploads/files/vivewer.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/wiwexoreso.pdfIn PDF document text
    • http://torgoborud.org/images/file/14584014270.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/19344653187.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/41254149289.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/gorufolumotulolexowuke.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/baludifebineg.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/75909901630.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/95031632885.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-16/20210916050622224508.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/jogut.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16155e7663bfe9---piwemimofapevavalajag.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/60128625546.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/gewixomatis.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/11559275123.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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 17192 bytes
SHA-256: 8ff51436fa0764294b24a8bc3591891070d47eb8ad30cb6ddf3773c60a45ce97
font_02_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10868 bytes
SHA-256: f8b8ded5353be243388c45b5f04767b8f955e0ed851ac3c9b82e8747a463eb49