Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ebe4190bc2aa5d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 08:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b40240e94b2eeef38764c7066d17765 SHA-1: 524908bc7295a31ffd23790d905c9d82d5304361 SHA-256: d8ebe4190bc2aa5d50151765c1303eb95a28d380c3c39216a5aa33ef2e8a79c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to unknown or potentially malicious domains, and is identified as a link farm designed to obscure its true purpose. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://jcmimoveis.com/userfiles/file/93994163420.pdf In PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/64954084921.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/43826266499.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/kaxulufamolafafabi.pdfIn PDF document text
    • http://keitbg.com/images/files/95497314540.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613deeaec0173---dukigokefexo.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/30135253204.pdfIn PDF document text
    • http://twilaw.com/files/files/woson.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/benazafenumaza.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/28099227421.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/somojegig.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/53123524026.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/90218769978.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/98631411231.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/tibubosipewazesasevosilul.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/50093386382.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gapujumojasamuw.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/98223732446.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/zegaker.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210903155523.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/nofafebe.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o94be5vtu1d88g4076tla9kgj4/98563845748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+the+nail+gun+in+call+of+dutyPDF 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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16912 bytes
SHA-256: 204f3008b264b9cdbbf5cc778f043b1d4e022f87f9b45fea5f3d228182b1624d
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10780 bytes
SHA-256: 9c9aee8cd50403412c8b27089b0ac5ef5519c1b6af43a43c58a7577f11f3ef45
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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