Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb36bd697c605e9…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 05:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11ab685e8a12c6f883ddef53d7352971 SHA-1: cbd565cb445560913c8bbc5c996e40e3b33c50f4 SHA-256: dcb36bd697c605e975c0a5fe1f7a3c520487c1ed07a348396d59dba0dd428b32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged 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 are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=quantitative+research+methodology+pdf PDF link annotation
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jelutaluk.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/dedalorubifesa.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/vatigewuv.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/31460368305.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/58444444815.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/36844976890.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/35653198074.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/71691105467.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/60677243734.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/viludajumo.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/samotipes.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/pulewasavekepozevipalejo.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/lowibimizutapevoxal.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/bajojogisiguxu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/94683763841.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/11387113682.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/50283566762.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/674522924.pdfIn PDF document text
    • https://superchills.com/userfiles/file/62667661162.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b638120a9386ef9bd0e847213e7846b6/firemegumaraxi.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/pagomupisepuzemuve.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/gopizorisovonifev.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/wunexojunozelolo.pdfIn PDF document text
    • http://harlit.com/upfiles/file/39138513618In 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 17756 bytes
SHA-256: 9c869fc4774888baa3b6d3026ac07a001398a0581589a5c073c450adf53a7322
font_01_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 11408 bytes
SHA-256: 1e74b3fa9b2dff862c8ef96953217dea62bf9f0bb1c7993b53628c6878e32d2e
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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