Malicious PDF — malware analysis report

Static analysis result for SHA-256 c935dcf1db6aff42…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 03:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01e6e1fe44b93a2caaed5e10158b86e1 SHA-1: 701da1d9a4391f23a9593e79e1f6c415348f3fdf SHA-256: c935dcf1db6aff42fa5d0102e6a363ebfa181b5ce0914246f84eb2a0d4e58be3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=worms+in+human+anus PDF link annotation
    • http://piazzademarini3ge.com/userfiles/files/78675978498.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-18/20210918231851567742.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sga7csh1eqjm0aglvjad7ururs/dadijanexitekakaji.pdfIn PDF document text
    • http://modero.vn/upload/files/sukipijanemeg.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/7860844343.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/89198500276.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615dddb395bea---85281010233.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/xopasurorerunosuzuxelev.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/geser.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/rupudalapimafitukerudi.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/doruzodisilovoturewonokag.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/71213742271.pdfIn PDF document text
    • http://medrea.ru/upload/files/wubodexagokolanani.pdfIn PDF document text
    • http://www.bash.cl/media/file/30358410028.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/40815719968.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/33322922253.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/72030750190.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/52521925897.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/53979022676.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/63649379809.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/95318365563.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jawobitijod.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_off0000c86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 17420 bytes
SHA-256: b112e230ea6e940270878227a213c31f35ba2db6fcee141739661ae4df3b3d5a
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10192 bytes
SHA-256: a075551135f4839884967ed826e16b66b9d50b6e41fdf82b1da5677af39c2926

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