Malicious PDF — malware analysis report

Static analysis result for SHA-256 e836ecdc9eca033d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 14:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94a33bc49dda38f041d0fcaff58bfa9c SHA-1: f8e8c78af28e5e451feef5f908b8a19df4626528 SHA-256: e836ecdc9eca033d9f9567958efd6c1e5abc338c7c16aa757cd28635262f7670
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://perfecthospitals.org/FCKeditor/file/lijil.pdf In PDF document text
    • http://phongkhamthienhoa.org/images/files/42377132474.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354feadaa00---38727965318.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/65875315524.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/35784088475.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/64299744531.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/kobiwivat.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132c70251df7---tavajejozugeluximop.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/lisirumuwad.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/jumafewibazufutux.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/deturevabisusonelajo.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/jidebexutelomune.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/26928286083.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/velakiw.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109151937245480.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/98117705631.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/dinan.pdfIn PDF document text
    • https://subded.org/userfiles/file/52041342951.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/30460151102.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/musabu.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/70688425625.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/guxamogof.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/37561805348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hacked+dr+driving+2PDF 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_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 10384 bytes
SHA-256: da169d6e9adf933dc5725dd98f65564ddb18b084bac063ed2ee12fa8ed37d888
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 17368 bytes
SHA-256: 08e096aa8cfa6254cf96c3c54607450a04a2dee5dceb40a734e2a2c675e7c04c
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1