Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc63570ff1dfdba…

MALICIOUS

PDF

70.2 KB Created: 2021-10-08 12:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f989e26cd4cb286daca6d360aad711e1 SHA-1: 799f3e6231e7dff4a3da62af4fbac51e85b5910f SHA-256: 2cc63570ff1dfdba68d7360123d1510effb660bd5d1f39c195b7f7b22df72d77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its malicious nature. While no scripts were explicitly extracted, the file's structure and embedded URIs strongly indicate it's part of a phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=can+you+defrost+and+refreeze+ground+beef PDF link annotation
    • http://giasudaihocsupham.com/Images_upload/files/waverosoxukadozoj.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16131f8e238f68---fanidanapafogimorup.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/xurawifawale.pdfIn PDF document text
    • http://lovesenergy.nl/file/35312943960.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gokezogivez.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/migome.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/babizufig.pdfIn PDF document text
    • https://hale-metalice.com/images/userfiles/xotefosadaxufulosokunen.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/gazilidirazakamukabukaset.pdfIn PDF document text
    • https://geniodelweb.com/file/49972611071.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/suwofojigizod.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/nupafufodadokazoxofa.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/putugufimosisoxu.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/tokudoriwazuto.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613380f429ecc---27950121643.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/36869638474.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/81251339748.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/94875921698.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/daziba.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/pexosu.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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 15692 bytes
SHA-256: 20d4221d82e665aed590fd4f8d74bcb092e13be7ad3701b089170fc67517c34b
font_01_sfnt_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 10836 bytes
SHA-256: 4d8c850d97e0197ee23908ca520db2e5fd0b6301dca68385c084e1cf90d8857a
font_02_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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