Malicious PDF — malware analysis report

Static analysis result for SHA-256 819111d33e52ed5b…

MALICIOUS

PDF

95.9 KB Created: 2021-09-08 17:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92d6b4a9d11bc43ac36e9d4b9de84fc4 SHA-1: 8e1e57413f7eb026335e417eda78b6dd4d28accb SHA-256: 819111d33e52ed5b301376c1e7b89e839465e38669718ef7703491ebe8239f07
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to potentially disposable domains, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/nepisonewafixiposaf.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb092e36---77188469897.pdfIn PDF document text
    • https://swiz.eu/files/editor/pitiva.pdfIn PDF document text
    • http://stylekd.ru/files/26324827293.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/92840749468.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/39767321606.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/divowelugobisudisa.pdfIn PDF document text
    • http://mousike.it/img_ins/files/45983193342.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/99654974281.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/14636183385.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/13347799624.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/sujuwisewoxizetatisow.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/judaxor.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/72193740121.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/kesozof.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/migipenenarorefe.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f038c43cb1---99218084543.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/relubolojunoluwe.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32790766087.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/vunaxeniduseb.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/33720088363.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/niniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=language+learning+vs+language+acquisition+pdfPDF 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_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 17460 bytes
SHA-256: 276b55bc3f8cd2006177762f981dfc7d8f12ca0533ee4520375b38672dc2b985
font_02_sfnt_off000158b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B2 11064 bytes
SHA-256: 183ea0ea667d2b24460362f85ca2ea043568d80dd866b5c4c510dcc70c726836

Open this report in the interactive analyzer, or submit your own file for analysis.