Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9e5bad9d690eb7…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 01:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1c91042d0fe4673be964564ceb528f79 SHA-1: fd772ca0c94ea7a2f83962fa8659013b889a8fbe SHA-256: cf9e5bad9d690eb70c9dad26ae4e0106b6d33f5ae88d2a85642a911cec6461a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=home+value+to+loan+ratio PDF link annotation
    • http://everintelconsulting.com/upload/file/202109160846297772.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/98153303977.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/37113128157.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/12317981590.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/41619337228.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zavugozotemelu.pdfIn PDF document text
    • http://generoussecurity.com/uploads/27281236084.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/69772626753.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614595134107c---lexagemojukovujonaj.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vuvuniwotifiruxazifudun.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/linajuxegiwobolojito.pdfIn PDF document text
    • http://dytac.hk/userfiles/lowoniwupam.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/61345745968.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d11c128c---65530302124.pdfIn PDF document text
    • http://ewtch.com/upload/files/50432186823.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/77030074324.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/xadofus.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/miporimogiwe.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/35850099848.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/7020735467.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41932392011.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/kebexugudasi.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/buvofidolelafuza.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/46126279578.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_off0000b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB184 10260 bytes
SHA-256: 0d9007ef5223ce8d20d54c6c05ff213407509c11af49cb6688230c28e9f7a799
font_01_sfnt_off0000c873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC873 15596 bytes
SHA-256: 05e7bcd969c599ccdf41417f68df8d3621f6fa05cf83ef4c9e310003b70075eb
font_02_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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