Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183ab0ac1fbeb3f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 16:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 940071ac5bd229c5a3d4780779fe8c57 SHA-1: 39f9fc316535667ca49f60f62c2b1f18d96372a8 SHA-256: 9183ab0ac1fbeb3f474bfd74b101e3f41630871bc91b0666203637def6804257
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection scheme. The PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for credential theft or further payload delivery.

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://oniceh.ru/uplcv?utm_term=best+free+jpg+to+pdf+converter+for+android PDF link annotation
    • http://thepokeluau.com/uploads/files/fagijuxaligavulo.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/gofukebinenikemen.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905130919.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/rokuzogubawutagowute.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/2344896779.pdfIn PDF document text
    • http://inercial.es/uploads/files/zavivevisusuxekoniw.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kusexadiwaf.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/09ed8505459657c54ce56ad57ba1cabe.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/tiniz.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/tidebupemiwaxonijamadeb.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pakesipujotapik.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/vuruxubobopu.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/92742879546.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mivisoxava.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/54773609817.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2abc6296b---26541592636.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/pikav.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/zinevuxigodifes.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161363d51cc1c7---lebur.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/46362152343.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/4117738657.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/luramowimimoroxe.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/11550966787.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/56554197316.pdfIn PDF document text
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/burujewez.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_off0000c08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08A 16516 bytes
SHA-256: ce96c9c92b326e1e2de64592206ac55ceb33a35da868c912e8af9a0d0ababa00
font_01_sfnt_off0000eb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11000 bytes
SHA-256: 5c0f21767ca06fb7b4057b258b0bfd270de0639293c540b0ba3248f041459f99