Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b9ae37612f4f3e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 16:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2361ea630e499b2230e347136a092f57 SHA-1: 30953fa5e87039415f3eb4f47a63e02bd7b805a0 SHA-256: 40b9ae37612f4f3e706442ccf34a6c5511d439deff0accea5101bb56a96503f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that the PDF is a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=minecraft+apk+for+pc+windows+10+free PDF link annotation
    • https://uat-tunisia.com/userfiles/file/bopudu.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/lizadanadipibafinolel.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/64377099428.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f441a1d28d---11673409568.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/piroloro.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vorotegifakajuwufuxelu.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/nofivunuvovopudidiruwufu.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/80353404091.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/rotojojepenaliwutedane.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/71048707856.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/74229108837.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92614601568.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/28082726166.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091515310373499.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/14310797490.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/tukibujidemefodewopiv.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/jagajipefuzifov.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/derumumuto.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/vogakut.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/vugedamugavox.pdfIn PDF document text
    • http://netart.hu/userfiles/file/febosog.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/xemusagoni.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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 10912 bytes
SHA-256: 82fb60244941f3940380d4ff2d38430a2fb55ba023fa52d3c5d54414b4a9da19
font_02_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 18340 bytes
SHA-256: d9ab31bdf3b19ae9470b2b14bc040d60f6ae7d204c957c7aadb6697bfbbe640a

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