Malicious PDF — malware analysis report

Static analysis result for SHA-256 524421c257d79b4b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 20:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f172682fef3b4d5b813ce59833ee3d9d SHA-1: 5c2b23ce3ce117560430f71e3ffa5dec992d13d5 SHA-256: 524421c257d79b4b3f854cdcf2b20c3dbe8bb6fb6d9b4658ed7b0d27b9322665
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to facilitate access to these harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://synerhu.ru/uplcv?utm_term=omron+wrist+blood+pressure+monitor+manual+bp652n PDF link annotation
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/pegukuwivinos.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/tetakupivolimo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/22090891930.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/beninirazo.pdfIn PDF document text
    • http://bndweb.nl/upload/files/zolugu.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/widisezunijoraxejod.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nevejevemetitow.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/33224297226.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/22415476923.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/54444711737.pdfIn PDF document text
    • http://888chji.com/userfiles/files/lijopuwazororamukazal.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/44395073912.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/53135494927.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/9452885078.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/30192807836.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/80274919497.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/58319873489.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/57175454840.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/33210506652.pdfIn PDF document text
    • https://terracell.pt/images/file/nitotijomopamodamimov.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • https://proxus.nl/file/40629034609.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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 17264 bytes
SHA-256: 05ca65c3ca7c1dbfc2f9d34cb8cac04c019dea4f9a0e61ff45f677370e8cdda1
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 11324 bytes
SHA-256: 34069b5acff1910759beb3f3c7808852169efada7bbe00a685a30557d7761154

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