Malicious PDF — malware analysis report

Static analysis result for SHA-256 4225455b7a8b2582…

MALICIOUS

PDF

75.1 KB Created: 2021-10-13 00:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c7941f5e10c0615d2c9901bec534e8e SHA-1: 8dcb464c1125463f48376400d06c17834856adf7 SHA-256: 4225455b7a8b2582428f53b2b886bdc0543fdbeb8dd4da6f55089da8d6798b52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://raffaelecavazzoni.com/userfiles/files/90718754000.pdf In PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/74278528248.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/59691872852.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/gafed.pdfIn PDF document text
    • http://cartopack.be/Images/file/denovanawej.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/luwezivutadenodi.pdfIn PDF document text
    • http://benly-carson.com/product/files/mugafobed.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/92885855515.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/devitasovujebupumejaju.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/93849860389.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/25514825363.pdfIn PDF document text
    • http://rcot.by/pics/files/fitoditopeparefamanowase.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/9623897308.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/61621437583.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d9fc062626d4a54ae5872e04e9458ad4/soseb.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/9754871090.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16162a098f254d---19942797068.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/59856443103.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/moliwepepunovufu.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/mobatesamozexodumuta.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/givobobakoda.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/defadolawasuv.pdfIn PDF document text
    • https://webmanagement.jbclub.ro/images/file/dafemanalukakud.pdfIn PDF document text
    • http://shinhwacar.com/userData/board/file/betininitoxoledu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/panoxovugazomewuxa.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/10250748232.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/85261637949.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/53731383970.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/xPAns0MRe5M/uplcv?utm_term=is+lead+a+metal+or+metalloidPDF link annotation
    • 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_off0000c1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E5 17812 bytes
SHA-256: 06122519b3fbcf93c1ef98f8d550aeea57bb4727158f985bbca3e083bd24e7fe
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10256 bytes
SHA-256: 622d6a10b71c285ad87a4152f95deb76bb68ab1cd5acc04003a4b4f40ff55f0d