Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9f53da70c867cb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 12:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7bebd9cb1ce507e58afeacd8307cbbc5 SHA-1: cd763f57abbba407d360a563d4a2ef505b61858b SHA-256: fc9f53da70c867cbb4a564bcde7930083ba0ab9827f4c1d074367ce483f0c5fd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dtpokebar.com/uploads/files/zegevoluxefuxafimi.pdf In PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jatefevomokijir.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16143e60a871e9---23701031286.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/5175224659.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/regavofagubovatusisowaf.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/zopebupijabet.pdfIn PDF document text
    • http://esistore.be/userfiles/file/jurikizajagubuw.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f74b26395e---44780747442.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/xufejaru.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/mizamowusonifogarozima.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/20876376296.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/69790883890.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/gojonojuwesukojoromiwute.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/dudoxanafoveb.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/73741658790.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/sokawa.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/butojozefox.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/xedopefewisibaze.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tojusonaru.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210910_D47C9325F1F1C052.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/dedirorimokipasurokowul.pdfIn PDF document text
    • http://twilaw.com/files/files/63714706999.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/96687051664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pubg+graphics+tool+apkPDF 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_off0000c47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47F 16776 bytes
SHA-256: 8e0af2f21a0be0ad93ceb4122cba18705bb5e657dd601530e7543f9ce35381b6
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10748 bytes
SHA-256: 11a0dabc38f52541507df18d397d3b8b0ed8db98b555e1598854258292b5a68b

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