Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c74514026d85cc0…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 09:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3b7dc814bc9b8fe636d9ab07aace970 SHA-1: 003b9f7c71de847649e09a520d563a1f7cd40c0e SHA-256: 1c74514026d85cc01834651446db8d0f074d650ed122437bbb702daf0a61397f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=teaching+lexically+principles+and+practice PDF link annotation
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/sokawezawunakuk.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/22638342703.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/26435416491.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/89730569164.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/mokimenide.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/xekiregadunosuxubawiso.pdfIn PDF document text
    • https://landi-bg.com/images/file/22563096959.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/98050228013.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/fikuzex.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/pulixagowijomenirirosis.pdfIn PDF document text
    • https://fratellifurloni.it/file/88606255038.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42932620056.pdfIn PDF document text
    • https://diphong.com/uploads/pudimejexukadejitituxaw.pdfIn PDF document text
    • http://med-os.com/user_upload/file/18372351086.pdfIn PDF document text
    • http://chamdure.com/DATA/files/38491379552.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/95923006185.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xebamezogexibawawobenu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415f090e8a3---pedal.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161516c89bf00e---kuwoxakefifuza.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/84671846349.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/vawunome.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/20584748749.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/tedorabolijodabozife.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/45232648218.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/pexarimaginagof.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_off0000b2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 15148 bytes
SHA-256: 01981480c39d9ca2b44b4c3dfaca5977f714175b64da2eacc98b85693e31d9ce
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10852 bytes
SHA-256: c12e44fd2e0dcc317698e467ce92942b3fbe37585ae8e2ccce9c8a571e306a2b