Malicious PDF — malware analysis report

Static analysis result for SHA-256 e885b9dde847f457…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 14:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66c5af12b9ec550864d4efdecc782cfe SHA-1: ca5d56d6a2b2e796cd517e1186ea660bbdee1f5f SHA-256: e885b9dde847f457bebcb47adc1855e93e1469081cff70294445f0fcf8390b46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

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://sutipatika.hu/userfiles/files/17239064001.pdf In PDF document text
    • https://santa.my/images/users/00000000/files/kijogigulivopizabur.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/33660130009.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302c79ee6c6---214451203.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/57367141946.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/62089308123.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/22087095354.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/74916959355.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/jirok.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/60103625092.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/94851453032.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/dikekunikuwezipabe.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/kenidotikemilep.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/80099999941.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42455300077.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/vasulivup.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/gebepilemuxefitide.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/parejifobonisazafa.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/jopexisuvajafadegufil.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilulalevofa.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/81358106000.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/vezixipu.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/resokatob.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3f3b614159527df3bfd12b577c647108/fumubaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=watch+coco+free+onlinePDF 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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 17844 bytes
SHA-256: c7a376cd318af5474e26f97652de01bf49462f308770c76692dffd70b12db54c
font_01_sfnt_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 10260 bytes
SHA-256: 7f7f36385b84aeeaf98b56e8ffaab89b9cb39cb8b34edf40751a7e634c30c3c3
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1