Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebcb6d4a3c0808b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 17:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f293029e73b0daccaa2c0edeb69ec78 SHA-1: c501ec167542a03cd75313cc7d7ae4911d1566dc SHA-256: 6ebcb6d4a3c0808bf4afb5a9aef01f03ca1825323d0f22fa134bb4dc006adb79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs, many pointing to disposable hosting, suggests this PDF is designed to redirect users to malicious sites for phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=how+install+apk+in+pc PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b7b2fb71---49535352291.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/70098781987.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/71017910335.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/53799254887.pdfIn PDF document text
    • http://enewind.com/pliki/file/72261503384.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/logapewukoj.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/11381584045.pdfIn PDF document text
    • http://aquatherm-graz.at/files/50945307225.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/pidosedonixi.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jerutukonewojisojojumijo.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/majunemerokoradev.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109100659597396.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/55026714229.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/78779102293.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/76562905888.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/82352540372.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/tabufazujativiselaki.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/pujukebojegijekuvubagifo.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/14569482015.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/27162673905.pdfIn PDF document text
    • http://infosierra.es/images/editor/73136905950.pdfIn PDF document text
    • https://mcsfood.com/images/file/filixireledowus.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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 10304 bytes
SHA-256: 2b129fe08c0a2d03d292175ea2492f297b509ba54f3f22f30fdea64e47ec6bb7
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 18704 bytes
SHA-256: 885936e2e30b10244e35b5aa5fcf1b5ecd16236d29588467c8e3b417e93718f2
font_02_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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