Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6fefd936a77989…

MALICIOUS

PDF

70.0 KB Created: 2021-09-09 19:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 454583751c12fd0888c068c706a82b3f SHA-1: 418c9106f1cf345012842cb433d208595a7ff897 SHA-256: 9b6fefd936a77989eb616ce525833fa29e6f4ce00c5038a7581a80d285774b35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sanmorales.es/userfiles/files/dudufekumolapuzapevew.pdf In PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/75115865335.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4948417bc822f46fab425e3b647bf79e/6536668115.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6102c73319843b7517cb33a1a82bff09/82982505870.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/76608926857.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/fijenu.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/5631148997.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/zedadufopododames.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/bexorebul.pdfIn PDF document text
    • https://quizai.com/uploads/files/98452406220.pdfIn PDF document text
    • http://sooclose.eu/upload/File/vifibekoxarejaluw.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/88250525171.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/76302973787.pdfIn PDF document text
    • http://wmsone.com/eimages/file/98288405540.pdfIn PDF document text
    • http://abwrva.com/uploads/files/nexumowiru.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/vidavifurutazow.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/97453508943.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/76021650457.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/85418269112.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/33263415224.pdfIn PDF document text
    • http://sbcnepal.com/images/file/2187683231.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/fapekipelijodos.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/58891035162.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/41516590671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ringtone+app+in+tamilPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 10372 bytes
SHA-256: 007e18d30bd2931b1f2e75d3013ce1649ff6e5d376f7060bbf87247841eefc4f
font_02_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 16388 bytes
SHA-256: 7aca8741408e7fa016a7938bf0c9822401e0f8d81be255ba596601ca8f7da4d0