Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb615098e1def708…

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 07:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4488c945b1a033f4143c2f8756f0e7d SHA-1: 8db34f920143443374587cd5f275a07cb92318d0 SHA-256: cb615098e1def708d83d81c00a4b5f12bc1b4e8eff8b9cc5af517aa0b67e9fc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, with numerous links pointing to external, potentially malicious, domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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 http://villacappuccina.com/userfiles/files/9355712145.pdf In PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/xopuzapa.pdfIn PDF document text
    • http://texmet.pl/userimages/file/38666154057.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/kuselowobegufa.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/98511142065.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/benobazazigoxemulesofaw.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/papijawowexi.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/36975623021.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92288350961.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/rokapurafusuzed.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/71439126761.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/zidufafup.pdfIn PDF document text
    • https://cargotavio.ru/files/file/povoxizaxopawuregenoleb.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/2255431750.pdfIn PDF document text
    • http://adriennemason.com/assets/files/banegob.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pazorulilaropavuwatut.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bagemuxafepivo.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/libalamosoxadenanimir.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/52590805315.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/rizinotusonuketebitefovi.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/xugoke.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sexabuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=get+all+files+in+directory+androidPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63676126019.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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 10624 bytes
SHA-256: 6d9327f9d239e22a27a823f67c51c1dba564a2f6af0c29c0ea820c7aa1a0b7d9
font_02_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 17388 bytes
SHA-256: 429d0f09ca39aa6a978ed8df61376f2c3e28df803b614383bd1018f018aaf615

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