Malicious PDF — malware analysis report

Static analysis result for SHA-256 2055aae044eca629…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 00:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b4bac18c215d4e7d0f9c16cda8cab5f SHA-1: 594a1fb3a948bb75fef0705613abce6b12035574 SHA-256: 2055aae044eca629393efbd9a92c474f8b1f3be340a36a23487d330cff304a5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many associated with link farms and disposable hosting, further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=game+ringtones+for+android PDF link annotation
    • http://velocimapper.com/webfiles/file/kizexivawozefotejovevoz.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/nogowizep.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/relukujagalekox.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/surexepejexafunuf.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926364c4be---dudojej.pdfIn PDF document text
    • http://soc-in.com/data/media/files/nudilat.pdfIn PDF document text
    • https://mackbeks.com/files/file/banuwajepamipitilepin.pdfIn PDF document text
    • https://resicolor.com/upload/files/nepiruwilirenuxukunodel.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909051840.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/vuvufiruja.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/xobolafasozifezukiwave.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/4749804954.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/mapovebido.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/48148485245.pdfIn PDF document text
    • https://stotex.rs/files/jenokob.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/36709614845.pdfIn PDF document text
    • http://electric-kernbichler.at/93292544264.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/runakovafobuzelavofovom.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/43975918699.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/91660398272.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wedifoboditomi.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/72764309869.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 10688 bytes
SHA-256: 9eae7869e9ab542fbe9b223f46cab87642882063e56dbc1c6fcb45a2e635c559
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 17560 bytes
SHA-256: c37e54ae4ff4eef83c52c5f7d97acb3d138b45a321fc1ac071fea3a48c689be3

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