Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ae6b0457fd219e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 15:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40eac9fefc19cc31d2d290181db010b7 SHA-1: 97808d6d8f7769225eeae35e9a9821622b25f7bf SHA-256: 04ae6b0457fd219e149560152dc280ffa5f5b559ce196bfdbbaeb3a085a3d48f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate a malicious phishing or malware distribution attempt. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure that likely leads to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://officialbacknumber.org/editor_up/48600770991.pdf In PDF document text
    • http://originalavto.ru/userfiles/file/bovagedoletojutewowajas.pdfIn PDF document text
    • http://awards.nl/img/cms/file/moxuxerevelilesazivof.pdfIn PDF document text
    • http://fittbikese.hu/files/file/67487094656.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///sifugumowidewape.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/69046711299.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7c2d660de55f72c8feb5d901bc7354d4/37765440585.pdfIn PDF document text
    • https://slide-bearing.com/d/files/mupolorosowebojetu.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/nerudeg.pdfIn PDF document text
    • http://mcutech.net/files/30970272852.pdfIn PDF document text
    • http://espokebar.com/uploads/files/fufezofota.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/39722699225.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613797c36e4fe---bifolubezetunudamo.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/tuzarorojefafupawonune.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/53520007668.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wukuzemalatufozerufovazi.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/remogimuwonofebasasipukak.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/xizip.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kulawopepubikuloninub.pdfIn PDF document text
    • http://metzlerranch.com/userimages/81609299800.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/51852076890.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/86786748479.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/powosapivipusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wrong+turn+9+full+movie+downloadPDF 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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 10940 bytes
SHA-256: e41d4ad7509082aa1672d7f5fce193c366776b007108521bafcd7bd17de787b6
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 17448 bytes
SHA-256: 361e3b13ad83c8a05b426904c357aad342904ff6d1d27c9df50c6f38c774f016