Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59039530fc1f9bc…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 07:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 766470604958382edf8f25f075f47cce SHA-1: 3321196fc98c9ddfdff0b950a791f48a96a7aba4 SHA-256: a59039530fc1f9bc19e8bf0de5310b401e0a48134a3072496bfce0b543e4799c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=advantages+of+rotational+moulding PDF link annotation
    • https://safe-international.com/userfiles/file/32079628207.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/16650994816.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210918102402.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/97009308020.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/kiwipowuliwogowobuk.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b64e1d5a1---wugiwimudolotituv.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/16718071013.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/60593378050.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/runug.pdfIn PDF document text
    • http://mariancozma.com/_user/file/sevifetaveduma.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/1184071403.pdfIn PDF document text
    • http://wamer.org/userfiles/file/jugararojegig.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/73980907236.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/32175578575.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/sunukuxefe.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/75789155243.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/11683012544.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d5d42abf0c28eabaa03dc730f9ab716f/16014199264.pdfIn PDF document text
    • http://danhsach.hagigroup.work/data/media/files/pelufesamiz.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/26131091774.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/62423014230.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/63921201043.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/jufuvobujokogabafalasi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/6508823101.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/53614842200.pdfIn PDF document text
    • https://energooptima.hu/upload/File/disolirunovig.pdfIn PDF document text
    • http://tahokart.ru/userfiles/file/gazuzelilafuj.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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 17188 bytes
SHA-256: ff4a35030582ba769e3970b5aa82c5ec48f66d8f0a3d57f72442138e640d4ce7
font_02_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 10844 bytes
SHA-256: 105e030873ffcfa087279bcbbb9cad66b1b68bfaa06a801110af104b2c1a64b5