Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ccebbfc4230c68…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 10:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3436ba3ba84535557c7a0f54102580c7 SHA-1: f6885cf61a645de75cb88739b03966a1b9c16f18 SHA-256: 65ccebbfc4230c687ef68ddcb5460d6d3d3351780088d2731f865819af57fd66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://munis-roquesalbes.cat/demo/vilalba/imatges/file/61609952800.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/rowixesadupunakij.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/98240542835.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/19388905396.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/juvijogubalaw.pdfIn PDF document text
    • http://vln.nl/files/file/gozedoweboxotowekis.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa5cdcbd6---kivaribefak.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/79572409450.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/gagotavafunuboxotik.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/80449025554.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/8842713711.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/73014829167.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/84787063161.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/78778676495.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/womuratisumawodesidupet.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/zejidinanub.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/nubolijaxotoba.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kiwelip.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/75385125820.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/56590273275.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/petitavifugi.pdfIn PDF document text
    • http://aven.su/userfiles/file/sajazojena.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/98373320169.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/sotubafiralerenelivebi.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fuzoxasusekunev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613038dc3b509---54286763691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=snaptube+snaptube+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 17536 bytes
SHA-256: a486b45032c95bb094cb99f972a99fc854be06441a88e423759e113a0bd8295e
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10200 bytes
SHA-256: 7ebf91a6d454c72b62d25d3abf68df3bef26c48ac4be7895bfada0b8333405af
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 16880 bytes
SHA-256: 3f7cf5f0a709b1116d2436fa17798ca0d5a44f9a985fa37fed67cb815a221d66