Malicious PDF — malware analysis report

Static analysis result for SHA-256 88868b48bb55a33e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 13:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09b0898dea3bb00eeac9784037ea8cb4 SHA-1: 17546b2c2562c02206aa9926b83e5f7b019446de SHA-256: 88868b48bb55a33e7de5562a8cef33e4da9440c531e910bbb7681e0a93a0ff46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://queure.ru/uplcv?utm_term=x+war+clash+of+zombies+mod PDF link annotation
    • http://hoaisonland.vn/upload/files/50381352052.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/mowava.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/ninaba.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/58864789918.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/madufawepiwuraxukov.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/90383142194.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/57521532843.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///14440756692.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/56066290311.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/74501780547.pdfIn PDF document text
    • http://sial.pl/galeria/file/rapifibavererupobixig.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/1471251642.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/jofiw.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/56976504550.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161309f41a91ef---8231948283.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613348d86cdb9---wawenusibamujolazoxilegu.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/jovozogomun.pdfIn PDF document text
    • http://apart1day.ru/file/terilijasarupitofojoj.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/77039960965.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dapakifokativuxop.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/zebof.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219171255261832.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/majisafalavomumejixomugi.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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 19348 bytes
SHA-256: 0fc1656b030164a8881266430772a26dc2e8993713a17b808839bbb1c371e63f
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 10832 bytes
SHA-256: b16b3c076be9cee8813b38f7604dd0b86048f69c651016e6f23b77494b7fc616

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