Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0984c5b2ed70e1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 03:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a18de347a444301dd504d4c507b8c425 SHA-1: b8ad08897e3127ea962a8f75e036e5d23bab87f7 SHA-256: 2f0984c5b2ed70e106bf96096688150556263b61416b7315ab00c1634031d6a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrusted domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and numerous external links strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=hill+climb+racing+2+play+store PDF link annotation
    • https://hobbes-group.com/upload/files/sebovoz.pdfIn PDF document text
    • http://insei.eu/userfiles/files/41603073496.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/84301445967.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/jatanirebegasetorel.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/kopim.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/gamitetawusapugoxu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/19011113382.pdfIn PDF document text
    • http://saint-party.com/media/file/36074712569.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/jisewatapaxipejatuxis.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/putake.pdfIn PDF document text
    • http://lex.tj/img/file/pezivijexogupuvuva.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/kixizit.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/59510399793.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/xopuwajusadokinudomo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75007cf63ddd251ce8931cadba0e8d44/bivilokosarijetijato.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/66745345194.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/ladisal.pdfIn PDF document text
    • http://posnlks.com/UserFiles/File/50627088707.pdfIn PDF document text
    • http://marymo.ru/uploads/files/bavajabovewat.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wurugowagetitevira.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391429e989b---zuzenogilibu.pdfIn PDF document text
    • https://artbynela.com/uploads/file/26876735861.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/muxasowu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/90180782174.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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 11080 bytes
SHA-256: 9a9060a44dd9040c19c784da15db0dbfdc922ab2febf4c65ec7c680b28320251
font_02_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 19188 bytes
SHA-256: 9e639fd3000dbe4420b26f6a7e2611fd34d9814c8cae55730d3237716fb600bc

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