Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c2ff70220dddf7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 13:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5687b4132d58d76da135f06bd14ae81c SHA-1: db8057ab0595c54f1a373cbd45c13576095f7f5e SHA-256: c3c2ff70220dddf731cb06ca1898b9911270def0b37d4ffc45f72591c4908b0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://coretry.ru/uplcv?utm_term=anemia+microcitica+hipocromica+tratamiento+pdf PDF link annotation
    • https://hoalavender.net/upload/files/gujagujuvizuwalurak.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/60471411945.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/nawesuxofogidaxuj.pdfIn PDF document text
    • https://satesayap.com/contents/files/femuz.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7088809296.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/26574759135.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/lotanapowubunavepubol.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/92bf00cd1b6cfc80a9da0cd8ba1087de/titizupasapofexotewuxi.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/98159797933.pdfIn PDF document text
    • http://ge-mak.com/files/xulumisutananej.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/87965533363.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/luvakemez.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/81710983245.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/vinetanidogidixorotele.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/2833299393.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/66455523926.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sekiwafedufofanowapexa.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/dumafifaminez.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090110535976.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xovofak.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/lebipiremefu.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/mivuwog.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 10652 bytes
SHA-256: e06e988512061c26c324df0981ce08b81256340998a816c15045a203d6587f2b
font_01_sfnt_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 15168 bytes
SHA-256: b5401fcc96f196c9eaf14eb174b7831bf16496845124118732982989ce020c2c
font_02_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1