Malicious PDF — malware analysis report

Static analysis result for SHA-256 5017274ae97370bd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 14:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bdb3c7c0d24ee795f82f2d63fbdb2fd SHA-1: f35f9bfd1e505864ff55ee56bd66a298cd665711 SHA-256: 5017274ae97370bd513cde7b76b762e4985c7053fcd937d278003347baeced3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is a link farm designed to redirect users, likely to a malware download site. The presence of multiple disposable hosting links and UTM parameters further indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=garry%27s+mod+13+download PDF link annotation
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4325a1f64---29067093605.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/xejutevetalowulofan.pdfIn PDF document text
    • http://torgoborud.org/images/file/gijisomod.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/89862015851.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96508301308.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/nafewegerivad.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/84790751629.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210921/files/20210921175408.pdfIn PDF document text
    • https://chv.vn/userfiles/file/61367979706.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/5866921192.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/54245955078.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/24403107703.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wosop.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/7721474267.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/gitebedewuk.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/korevezanegi.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/sixabi.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/xadedavewavoxotuj.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/12973932786.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/disunafila.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lirene.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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 17408 bytes
SHA-256: 8107503ae013ce1b783650f2c3c87d5adbb8751b15a57d789dd70eb1673cc6fe
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10584 bytes
SHA-256: a44400cfe152eb31bb15b6a8fb311de278d5c583e3904fc2c1157494db04e032
font_02_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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