Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3b67af7ea44356…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 22:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce23a5f192f32b7e3d651dc6ca7f08a9 SHA-1: 22f459efa2c4da34e28da0e679361ebaaf582df3 SHA-256: eb3b67af7ea44356a1ccc756f0fc39b75029d0f0b7c6e0efc8f3f91950273d63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=how+to+hide+app+in+mi+note+9 PDF link annotation
    • https://andhimazhai.com/images/files/romokuno.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/18675215198.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/padibometovekigutub.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e881802b032f71291dfe399430bc78c9/turumexaz.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/32472478900.pdfIn PDF document text
    • http://praguetransfer.com/files/file/zovexed.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210903055604402.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/81530740798.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/60088234095.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/xegufukolusojimaxozofil.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/kakomabene.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/45002557360.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614256efb2276---kevivugiviguboberateka.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vulopimujut.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/paxunosiwanuwarowuxe.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pezefene.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/genedivenalogozosofuj.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/nugolof.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/lalapenivizifarisi.pdfIn PDF document text
    • https://venus-forever.com/image/files/tanebogemob.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/zixujaseropobi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/8264191048.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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 17448 bytes
SHA-256: a8c6259d5028bb44a3e7a3d6b9ee006b9d766bf3cdbeb5db4a56a932ef61646c
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 10588 bytes
SHA-256: 8b45bb5fd1032f89dae5acfa200f42356b98777663dfde7c40f8ceb334a6d93c
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1