Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f6f8609493c619…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 17:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e23d3f2e030c720fd2351f71c3fec95 SHA-1: 7ef638c30502dc267c462ca91efae6889d898d30 SHA-256: e9f6f8609493c6194e4af2b1f378bb1ec187557a62bdec920359bb367ae34b9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'crewmak.ru', suggesting it functions as a link farm or redirector to malicious content. The PDF structure and embedded links are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=let+it+rain+gospel+song PDF link annotation
    • http://evola.it/userfiles/files/12386117747.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/87889220810.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/difubufatotita.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/lotakikine.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/wibatav.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/98546332280.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/72303918708.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/69ff82bf3ab14ab4ee61c9bf0f6fe905/mozevudegalakijopetun.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/16687376545.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b2bb3377---63601567316.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/zarewokaxupibenawubekabof.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/72565716220.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/32210232300.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/lanipepiv.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-4/20210904142739782264.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/98894269167.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/99538948627.pdfIn PDF document text
    • https://granitnet.hu/editor_up/59259318399.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/larumolibisexa.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/15284187140.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/88460740956.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/65667144833.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/selemarakojepatudukofexor.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/lokikizibedodejudonazali.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_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 10384 bytes
SHA-256: d28a44e4ed82a1130233d80073c65e8631a90f2902c7113ae5deb239ddbe712e
font_01_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 18324 bytes
SHA-256: 797b34f486b34090144f6b047a6f83f0223396c52f990a0fd4d3f5a9924214e8
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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