Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4739780c2a84b0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 02:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f67768cf8ca4a2fcb3ab91d9b0a15685 SHA-1: 04e06d5dfae15d5236a0dc1a5c3c5aded5902000 SHA-256: 0c4739780c2a84b04580fdc98518e3f8cc6afb91343702fe53241778f7916b8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=android+portrait+mode+only PDF link annotation
    • http://wksystems.net/HotelEstimator/userfiles/file/pefusetagexu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/56026033848.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/bovonevowusekokajet.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/senojorikuganuz.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/muwagogerikepovar.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/nebax.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/63495668484.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/gakotinusovulaloduped.pdfIn PDF document text
    • http://eko-uklid.com/files/file/58854572808.pdfIn PDF document text
    • http://archbot.pl/files/file/gefuruzojesudawut.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/53803183017.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e4750e9b95ec66db7337aa7bbf21c293/selamimotir.pdfIn PDF document text
    • http://www.grifin.sk/files/19326645351.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161378d8f9ab5b---36825702131.pdfIn PDF document text
    • https://jck.ro/userfiles/file/51223098056.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ravutiravusilodajurabeju.pdfIn PDF document text
    • http://clerus.hu/files/file/43939263579.pdfIn PDF document text
    • http://lscapital.it/images/file/91311896079.pdfIn PDF document text
    • https://drlanda.hu/user/file/fesevodefodazimupu.pdfIn PDF document text
    • http://pinxedien.net/upload/files/misokojopupuji.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/35457202259.pdfIn PDF document text
    • https://combrooncom.com/contents/files/matokavagegovitupof.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/muzifopaluwol.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/34200275236.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/motob.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/25593439015.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_off0000b4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AE 10480 bytes
SHA-256: f0d7b552d8a850b81805ec4a98573173ade763559637503f94c4b535365a9091
font_01_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 14972 bytes
SHA-256: 5737a17e4f246ee50e02c5e39b85d3f14e29ab3f1e8726dbb12e2cc8a6e6cc38
font_02_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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