Malicious PDF — malware analysis report

Static analysis result for SHA-256 570f505555e5f84c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 09:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37e7aa6b4919c172f47002bf5dcefbc0 SHA-1: 41566b5ab8f8f2f7a9c0ea19fda49c0d8451191c SHA-256: 570f505555e5f84c3d28508af277b25fb89b563cd7d653c8898c73640acc213a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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=redmi+k30i+5g+antutu PDF link annotation
    • https://tiemhoahaibara.com/data/dulieu/files/nikapezopurekesot.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/sotoferunusegexeku.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/595b917b0bf0b420d53e22c7923e9e88/tikalenibakokunida.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/pawuminemixelekidiginoj.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/jumizanora.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/59385891315.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/23281892788.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/73906325444.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/28350411958.pdfIn PDF document text
    • http://www.polni.si/Images/files/28665637562.pdfIn PDF document text
    • http://apple888.vn/luutru/files/63054384694.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/16066270974.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9bdd6611805c2423e2958a24b8826ccc/77630190932.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/sisepigiwa.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/xenurufolum.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/42329752791.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/jisowuguxatuka.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/46514962584.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/sabubojajil.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/82808024612.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/68604643708.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021092001085073499.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/76508137664.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/72111956586.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wugupiv.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/gelapigaverema.pdfIn PDF document text
    • https://12shio2.com/contents/files/ronadakokejagutisirureka.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/86563512439.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_off0000bf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 10824 bytes
SHA-256: d69a69862f291f58353596c2307c588ea13b9356835fe9c09eafef26c9ea5468
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 21032 bytes
SHA-256: d94bff071acb1cd76752f94e02a48162b7aa33fd7a589e4116604b519409a3d7