Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac54bd0f37dbe33…

MALICIOUS

PDF

85.6 KB Created: 2021-09-24 11:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 296e2e79e106049540092218e869f280 SHA-1: 6e79aab16e57cbb61de408cc1f7f265cabc5c961 SHA-256: 3ac54bd0f37dbe33a8892f896bd9b291993ba4ebc893494f96b698fac883a52b
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous unknown URLs points to a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://concilianavarra.com/userfiles/files/57637920345.pdf In PDF document text
    • http://myappartement.de/web/editor/files/48875545932.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lejijujokupolezapuma.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/71216201071.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/dikitezedi.pdfIn PDF document text
    • http://prograsifkalip.com/files/11124862433.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/joxunibiworeva.pdfIn PDF document text
    • http://artio.pl/files/files/66878709723.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210907231242.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/subexujuwudiwizewexarew.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/tetotasutipev.pdfIn PDF document text
    • https://pcetravel.com/files/file/sozeruz.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/taravezadob.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/39328498929.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/melekipifazozagovipif.pdfIn PDF document text
    • http://linker-apps.com/files/27229905660.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/8090857374.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/43983696241.pdfIn PDF document text
    • http://vlajamo.cz/images/file/magubapudanak.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/32897698472.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca1031c3fa011e314fa77cab4417e088/budadekaxisez.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092406064544656.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/63301077748.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/gemudazedifegavajeneko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apps+keep+freezing+androidPDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 10664 bytes
SHA-256: 34f4b284201f05060cc2c2c4ecaaa88dcf20d993dd2677052c55fe786e8aefe0
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1