Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93ef05f09c4b2a0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-16 04:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d4cfac13f239b4c11f90cf4f5096123 SHA-1: 7d137f60f82cf02c0f1675b2b9f7236c92a88e1c SHA-256: c93ef05f09c4b2a042c890ec6f6c96d17005716a48ab62d276127d3aefc50e9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://probeg2000.ru/files/userfiles/files/xikip.pdf In PDF document text
    • http://maxidmum.com/images/upload/fck/file/witaluluzitobofememor.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/76513206057.pdfIn PDF document text
    • http://malifer.hu/upload/file/kilage.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/guxitazanibawomu.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/43928482736.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/melenitonavugezaxevibeta.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/4264985046.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/90016365431.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/merogiruzu.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/23718992989.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cf45a84a---83198558307.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/56456311191.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6139b446040a2.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/25649191503.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/35136482025.pdfIn PDF document text
    • https://majubesar.info/contents/files/zexuk.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/62927933199.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137cf6b08312---61056813904.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/roniva.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/40740774291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=boom+beach+diamond+hack+2021PDF 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_off0000c794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC794 10800 bytes
SHA-256: 465c8632ad759c097969844f0dd4b569d7f08d7da4b69569e73ea7859f2348d7
font_01_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 18116 bytes
SHA-256: 0cd33759cc1850bb3143efdf434a8b91a60a2bb008d8507954898fa78dda4ad8

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