Malicious PDF — malware analysis report

Static analysis result for SHA-256 a237034d3b823d6a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-14 06:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f45248e12a1e18df951ccbf18c004bd SHA-1: 43fa31ad95b7565f13a61f286b0c344fb7f99b81 SHA-256: a237034d3b823d6a276564c30e07aa00067b5e326c242ee856e775693a9b34ff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to various domains, many of which are likely disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cremyco.com/app/webroot/docs/file/repobejuzoxuxisijetuwe.pdf In PDF document text
    • https://tavcam.com/upload/ckfinder/files/sovon.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/39636189311.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd06c4db4---dojupapibezaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134df98a934e---pexenofalezimotukulufipa.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/fedexusemepanevu.pdfIn PDF document text
    • http://candientushinko.com/images/file/64201599432.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/roxewitubelowawebekom.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/lolegasovuporuto.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/47470509153.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/babavenexiteneles.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/74573142642.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/waxejudukede.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zorugajugumejo.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fumetotebekogebapage.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/53141473207.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/52607792290.pdfIn PDF document text
    • https://promise-land.com/upload/file/kujakegirakokawunemozu.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/60382449667.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/jafitorekeweropapolum.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/91449031651.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/kagadarewepuzusa.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/36385553921.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/xinuwapebi.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913001056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+a+cyborg+and+an+androidPDF 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_off0000b6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D7 14728 bytes
SHA-256: 71e72558a9ecd317b68063c04cd37dc576a2d6e379c2cbe6574f0cf112a156d5
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10776 bytes
SHA-256: 87fad18d8698b95d8c324071dd75efd731f74bb9c975674d124a6c5397390dcf