Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb20ddc824940626…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 06:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06ef50e5085f0938d5980248dc4aee93 SHA-1: c56d81f3aa964606c697777808ff8e28d4199023 SHA-256: eb20ddc824940626c3c0b2fc78ae5648e2ec5ef80eecb034cd5c88a31eab28f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://beauty214.com/uploads/files/202109041133195305.pdf In PDF document text
    • http://celcg.pl/uploaded/file/momebasonirumavotag.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/rolomijegoxelulaxige.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/37704565776.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/45832194317.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/49232769018.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613926509e45a---duxugilado.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/27718185383.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/90353051862.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/44938491693.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/6146597518.pdfIn PDF document text
    • http://tradotel-riviera.com/file/10419706984.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/7421652577.pdfIn PDF document text
    • http://electric-kernbichler.at/laviweka.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/30810055404.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rc34etmdkg29cmsgd2dj6jvc23/40136812504.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zutiziwitojemido.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/423758147.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16740410761.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/36617158555.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631239210.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/zerefadiju.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/begoradezafidumomep.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/betub.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/42779203239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+web+series+free+download+appPDF 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_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 18700 bytes
SHA-256: 3620c121dd2a81057bf7ad6e579ab895ca9d866f2b71a8867224cf4463efb8f4
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 10600 bytes
SHA-256: 9646c353c5426181b2c89dc5253a4f1833ac523c11388a78654a08353d834483