Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1d6e762f9fa0f6…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 04:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f55c57651038031468ae8fcf69efa725 SHA-1: 5daf06852e62a97e032a00ab1b17b9018cb54e94 SHA-256: 8a1d6e762f9fa0f6316bac86f7e40743f8a11dac7f68d1ed2fb5bae6d7ecd60f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://himalmanpower.com/ckfinder/userfiles/files/vofiwefo.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///wugobasavaworiparalub.pdfIn PDF document text
    • https://pixel.bg/img/file/telajitefofuvawid.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccfb6d9bb---99337047142.pdfIn PDF document text
    • https://t2sc.me/userfiles/vowodejosuluwiworejamezu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/35672192576.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/detipetatedi.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/parebagadasumolapokudov.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/84615517683.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/levevi.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/sanafelitoxomiwekakugegej.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/93863870975.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/14002492361.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/wesedezu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/63753950014.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/xolikitamo.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/91007717367.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/voguwutanejogetupanovofa.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/saradopura.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/muxaluzuwif.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/gowuji.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/nuwenanisamepezapizati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tokyo+ghoul+android+gamePDF 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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 17172 bytes
SHA-256: e19d9395e45ba3cdb7397e710efad268b951db40f46c87693aa026b76e630885
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10696 bytes
SHA-256: dcd65f2269cc07ffc186f9ae609fd5ed82ed882bd6d088acfad870c66e1bea36

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