Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0efc622b525d20e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 15:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a20ac8d36107a96c81782978536a7b46 SHA-1: 116d2d98ab0dba6a3d7f231680a73b39395e4d0c SHA-256: d0efc622b525d20e453f545cd71056839be6cc39388290b3197d696f6c9483bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, with numerous URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://allytemp.ru/uplcv?utm_term=charlotte%27s+web+story+line PDF link annotation
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135734146d2d---87373643468.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e646a3627791a43d9423c0b75be884e9/71457000805.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/pufabewefusuvil.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jerugofinubamaze.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/14443964116.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/wexikewefimat.pdfIn PDF document text
    • http://cochemical.com/upload/files/fozojipaloxowenujoduzesa.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210904_8D1D800008726016.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/26002912292.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kufosikovu.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/jugemugijozojezaleko.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/25746944493.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/04091234217.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/71488296721.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/zanipo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/j38ukft5at4342og39dftut2fn/78861635392.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/wonubekedij.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/xagojesigigupozixu.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pelovotuduxadib.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/6107318651.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/lizamivaxexijedamaw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xawusife.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/97856025606.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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 16104 bytes
SHA-256: 6c18460c2451609e53e1fb6944660259b0fa65d1ce578491c42bd4e2857f3546
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10608 bytes
SHA-256: d318357dd9523cd93710eebb1a4c3aa0b37fcabab806198b998cd6316d48344e
font_02_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1