Malicious PDF — malware analysis report

Static analysis result for SHA-256 23127c861fd64c9a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42920216766a2d36a700122c222d2195 SHA-1: 60d8726df6813d5e0b992d1acfb2ccd19e7f530b SHA-256: 23127c861fd64c9a9ce693a46789ed4135e0d8cc55055874f108ff61023abc1e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick users into installing harmful software. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving a browser extension or update lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dulichtantai.com/files/uploaded/files/83103321467.pdf In PDF document text
    • http://agrion.org/upload/fichier/70961777278.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/67076580205.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/remalisulexotabupijo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/69340228914.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/nilopuriwes.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/86362201911.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e58b633c208f58c24070413a2e645f88/17168711113.pdfIn PDF document text
    • https://emenu.hu/editor_up/85594410811.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/nubavuvaretedizurib.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/64866190422.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/jedororop.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472f61b7058---60039468181.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/77381420207.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/gakinuwopo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/jinitenuwuvazogaj.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/86125379812.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/11891298642.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/miwezopilewazofumituvemis.pdfIn PDF document text
    • https://rinducm1.com/contents/files/fotetozulugurulo.pdfIn PDF document text
    • https://congchung7.com/upload/file/sibok.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161352fd165bdd---3877171776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=turn+off+data+saver+chromePDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 17372 bytes
SHA-256: 70c4882e1410e96460854b7a26c7bc23432baa344240ffa833e6794ade97dcf6
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10732 bytes
SHA-256: d0864a271958c75621a99834623b8d28d2bf5fd07bae8bb362591c78a2ef2c68