Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f235f866afcb6a5…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 13:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa03829734b5be4fa85d3314db5c8b08 SHA-1: 2bfd42e7012710e5c46eb0bbe078721d8d1c0b44 SHA-256: 3f235f866afcb6a57b0ade5c615d2622a26933d2dae2ddd7bfecbd546fcf2443
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are on disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=download+mod+harry+potter+hogwarts+mystery PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16145177935436---47930829589.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/75554997201.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/budivonopixof.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c97a3902e8441793cbaf3188b6c6c61c/kosijuwuniwetijoxezo.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/8118833006.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/jexidukomemuloroj.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29445308181.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/fekotamusig.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091320361173499.pdfIn PDF document text
    • http://wernitznigg.at/files/46428855468.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904050338.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/tavopi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3cd55a5d7f17c7c2f12fbeba297f4c71/tiladotadipuj.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/badogamalibap.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/mawuwotezalu.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/38315157776.pdfIn PDF document text
    • http://voijin.com/userfiles/files/18654656565.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/sawaxiwawovukozomowuf.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/35592240213.pdfIn PDF document text
    • https://simorgh.it/uploads/file/40347488423.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/47980046971.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/fivavomomenimom.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/94050806518.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/nonumanetep.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/napurosa.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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 17104 bytes
SHA-256: 15713fe4c895bb8e3bffdfb7657eeadcc632cfc0a593500b27bc3f65b56da994
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10948 bytes
SHA-256: c885fbda86f81ba9a692e327fd553ce9f7b7343e0872e5e08fe6f4143bcf1cbd
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.