Malicious PDF — malware analysis report

Static analysis result for SHA-256 e797076213ad76ea…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 03:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a3c595dee08a953ec02e8b1ee870cc66 SHA-1: efa5774daa48a0013d7e12827ad7362f90150a63 SHA-256: e797076213ad76ea05a03fca4bab8c2420b17ddbfd514b6fa0cedc9ebcf6e42b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://medvor.ru/uplcv?utm_term=excel+tricks+pdf PDF link annotation
    • http://evergladesharvesting.com/ckfinder/userfiles/files/pepipotededesutalezepu.pdfIn PDF document text
    • http://houselandia.ru/files/tedofituxaza.pdfIn PDF document text
    • http://puisan.ru/uploads/file/bibivuxefapiluwijosul.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/1383190577.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/22037255837.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/64270499160.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/bokokimizawuwezoja.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/dabubumij.pdfIn PDF document text
    • http://sayarbobinaj.com/file/niwavedipatobax.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffdc98f96---jididefuvedufidew.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/viselawukamatiwaben.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/sorifigakabuvenofe.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/8003846153.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/37189599550.pdfIn PDF document text
    • http://klpa.net/userData/board/file/14085982422.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910191832.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/gowoserax.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/204369082.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/97397132856.pdfIn PDF document text
    • http://benetalent.com/upload/files/33547532341.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3a0519920---rebotu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/53938294184.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/7008702864.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/mepalagaribiwewuwa.pdfIn PDF document text
    • https://megalight.lv/uploads/files/91984688653.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/98686375991.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_off0000b380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 10404 bytes
SHA-256: 932fec7a3e05f288b85e2d79fd4a0bf61db7099af39b8f2f6dfe4277f420f8d8
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 14624 bytes
SHA-256: 2745713203902042eaeec40e36372b596fca427a7464f239d5a31eb693ab0966