Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eabd44da9b4eeb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 01:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fd2b642ca5e45bab45ad3e0cb3213d0 SHA-1: a5cd7667ece9ad9de19d2e0b15fac8d4fb54db49 SHA-256: d8eabd44da9b4eeb13356bb24d6a94f409bf56da94534aa0529efe2cad8412c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious destinations. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://koddous.com/userfiles/file/bifutevarij.pdf In PDF document text
    • http://warmistore.com/userfiles/file/gomegodebibegipa.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/93171469207.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/fafem.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/rirorip.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/4061430383.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/38327610128.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/balunuloze.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/31686731992.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410db721628---pepujifikof.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/68945450163.pdfIn PDF document text
    • http://dongphat.net/upload/files/73950516900.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/79911653087.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/34771631925.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/saxoduvovetuxulibazexav.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210912_6501D456C6AF39DE.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/77342214195.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/zobovigexarinukevumitogeb.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mmignseuikkfsp3jptf46jb3l1/gezoxujopifil.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/juxovuluzawebojepit.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613167a5c667b---dinegepabomeluzivev.pdfIn PDF document text
    • https://artbynela.com/uploads/file/81088387362.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/58966222839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+import+contacts+from+windows+phone+to+androidPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/79610694214.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_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 17836 bytes
SHA-256: 047b3b1f724a61c4abc6c12a09d2d8fa7b596852c01d8e24b645bedc1069a0b0
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 10916 bytes
SHA-256: 999c6d4f8e67cf8ea9d8fb74a9ef49ccdf2832d82f0c09ce53891f7550321d0b