Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d438b571f6bb92…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 6f7404f8bdd1dc549231500d2e6324cc SHA-1: 9480fd003494a17fa24bdb03b8383a7015bc5143 SHA-256: 28d438b571f6bb9208b06bf736fce96658a04cd4eba4190c1d07c8f74d001fab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of multiple unknown URLs points to a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://travellerisland.com/files/nosadegobopima.pdf In PDF document text
    • https://gegeny.hu/uploads/file/vorimilebuwegesa.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/90070283209.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/98918742291.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/tobawer.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161466da894eb6---78733898946.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161406a111dfc9---33427496141.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/48112341126.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rafanugijejosaza.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/23174883396.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/betamamuwami.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/53695161180.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/86973469910.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/90178953008.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/905116768.pdfIn PDF document text
    • http://sswjeans.com/files/83196497937.pdfIn PDF document text
    • http://parentini.it/userfiles/files/70222107855.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/sufivivadopifupuperatuwo.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/noximode.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/zudegatesifudigaken.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bulutazova.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wavazakapojekademed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=conectar+aplicacion+android+a+base+de+datos+remotaPDF 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_off0000ae56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE56 17876 bytes
SHA-256: 50889ffbc92c0d786f7101b4dfc01d58a61133d8d558ffe7fb6b856e77207d2c
font_01_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10844 bytes
SHA-256: d4058ec12a4b9c123d70a646c0eea4857c53f28ad373753b4e9d7868a70129f3

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