Malicious PDF — malware analysis report

Static analysis result for SHA-256 920c73588106d0ec…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 15:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0fed364d455b765e22a287ace3bbd7b2 SHA-1: b858ee1a8add81911a75a519673988e9fc91e9b8 SHA-256: 920c73588106d0ec78de9e99a98a0bb1e5d2b01c5a22ca15e6151c5cba01847d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing campaigns to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tourpon.kr/FileData/ckfinder/files/20210914_40CF8D07242EEDAE.pdf In PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/nepinafo.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/kedoletekezedewelewejo.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/kebajotupikujikuwiwilaj.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/pozefatif.pdfIn PDF document text
    • https://edusfera.pl/upload/file/wekok.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/11411899705.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8d62d2074b460f1eaab192cee692cf19/nejitovoxa.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/wujevugiw.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/88428435778.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/74293569716.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/39278297081.pdfIn PDF document text
    • http://jainfarms.com/uploads/zofapinejixepixet.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/94186768950.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/74782945410.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/53684277958.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/kalidutojuwedulapav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbdae5521b---90261916170.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/62659679542.pdfIn PDF document text
    • https://mkontakt.com/dat/file/xojupevadaxolabagomuj.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/65086874952.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/55904106892.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/visasowunoderipexabogujow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=captain+america+civil+war+movie+in+tamilPDF 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_off0000af19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 17428 bytes
SHA-256: 0d77065ac1adc39679aab31aff2e0adf4f143e0d4b1ef8b359cc8b5e2a40c082
font_02_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 10552 bytes
SHA-256: 20b9360a14aaf997d75408cf0676954e6ba8c5944c534727b254e17fdd6bcc78

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