Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8155a76791230e…

MALICIOUS

PDF

81.0 KB Created: 2021-10-27 18:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-05-08
MD5: be25916df295651628333aa42dd8659f SHA-1: 4daccf8b161c7d24db4d01a9a1f9a7145147c3b5 SHA-256: cb8155a76791230e7c1373d4692fb2a4881c300578a63a466b1e6d8a9bed01ec
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=wast+of+time In PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/tozikifofuvisadupif.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/timikawojikigorakivagalez.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/kofuwulifu.pdfIn PDF document text
    • http://koralky.pokladnicka.cz/userfiles/file/68986801413.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/56788899327.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/13933246750.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/40806258484.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d48d9c111a---53517829744.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/33991477367.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/zuvutelepuvo.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/xatexoburogusuren.pdfIn PDF document text
    • http://kshp-company.ru/userfiles/file/73840791140.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/17833138733.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/4167113126.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08fa6d064---88772890001.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/63743275624.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/fuluneforavu.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/runatewodinurimip.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/82392003617.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/lixivokenufexusirapadexa.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/nomagevasamibifuvewed.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 extracted file (font_00_sfnt_off0000dc3b.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000dc3b.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10116 bytes
SHA-256: 588001ef4668fe66b5792ba18b8f87d18c44de40ad44a622b27ae493f767e803
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16960 bytes
SHA-256: a1c4f5d776bcea5be3ef6ae26b4f95dee6c548788e58ed7024791db6f84a3d40