Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccee08a4f3424a31…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 02:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 238bcbb5ab05dd94c6c38711c2c47327 SHA-1: f869422d92a2f7771024e36d1d2d9450d4bf9965 SHA-256: ccee08a4f3424a31cceff11fc2bdf749b990f652edc5123912eb0c280e4963aa
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chayka-svg.ru/files/50039975622.pdf In PDF document text
    • https://officialbacknumber.com/editor_up/bizeluvuma.pdfIn PDF document text
    • http://crm333.com/documentos/file/99122425066.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/fagenamo.pdfIn PDF document text
    • https://termofriz.rs/files/dovozudobudu.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/gizeda.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/wenivorikikuvepa.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/vugerobatasokemi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132844476d3c---61991439612.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/tasozepe.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fakex.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/kafedenetebat.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/51793121695.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/7889162262.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/80824089967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=new+punjabi+song+download+2020PDF 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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 11044 bytes
SHA-256: 2e86baeb1279d35380b0cf0b3280929413e51da5774fa4e418e17afcda031fc9
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 16864 bytes
SHA-256: c07086c73f46a6228a036f90ed2e425d48382748f0da5582c04647612a8ce7a3
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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