Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f3bb8e4aac8fce…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 06:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84838687e4f1dfd50d9441114b5f2cd3 SHA-1: 44b5d2d187f66b3aacf375915ad057d00de5e218 SHA-256: 94f3bb8e4aac8fce75c46bf857f626b4fb98e8c5ae24ebb650a2db69cde653e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=how+to+get+hbo+max+on+firestick+free', are likely used to redirect users to phishing or malware download sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF designed for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+get+hbo+max+on+firestick+free PDF link annotation
    • http://digitalqwerty.com/ckfinder/userfiles/files/55100835921.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/96741070046.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/tiwizejegobifi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/90slsvl0vqp98go7anrjjc5dj1/kanubipunataguzowotaneket.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/54287030620.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/85064748625.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/koxabedak.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87214661864.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/13252271574.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/suluzidimobi.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/zapowugotoxekuvedawumev.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630787323_1.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/nixolaxefis.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xuvudukak.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/duralenogevezukadaloreroj.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/susilivogetajizuxusezobe.pdfIn PDF document text
    • http://crm333.com/documentos/file/75466677865.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/21567020593.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/97493301382.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/gadomimedeboraz.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161314307d3933---kediwazixagij.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/56969994642.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bupego.pdfIn PDF document text
    • https://ksuskalology.com/images/file/2731928291.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 18056 bytes
SHA-256: 66b45f9c896a3834fd48c3ec7e9096c3a658007846c5e6a993b8116c058e6657
font_01_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 11148 bytes
SHA-256: 55795cb593629458ff6bd1c8385fe3ea3ce74db5c193182b351601cf62d25314
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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