Malicious PDF — malware analysis report

Static analysis result for SHA-256 5229709bcf8d1d59…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 14:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83110fef5eecb52b0800be00af16dbbe SHA-1: 2f44fc5d997b0feb88608041af8ddd3070e77264 SHA-256: 5229709bcf8d1d59ba1337e1033b5a89e77e40a8247ff10c7e2f659ec3c5c2db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links pointing to disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://tipsclubcr.com/campannas/file/74602603795.pdf In PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/64487914332.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1bbaed5f1---zujiba.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/moxirif.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/fufakux.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/35460031608.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/15879869765.pdfIn PDF document text
    • https://codecs.ro/images/file/sukosozanoza.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/10489433960.pdfIn PDF document text
    • http://abriganature.centralcms.cloud/galeria/files/mozikofupusutome.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/11722248681.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/kijebupenabaluwi.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/fifewinezolevoke.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/48466487795.pdfIn PDF document text
    • http://mastervin.ru/files/file/sitetekamijirowokar.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/luvura.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/tefojonuxo.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/durejugixoxabivosadozo.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/8057587312.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/simaxelizura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+all+in+one+email+app+for+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_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10712 bytes
SHA-256: 05c63f4ac70da50c1c7f6334a3b22d0c41275f8e1cda587b8afdc5b2231babfc
font_02_sfnt_off00011bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 17380 bytes
SHA-256: 658bc0436da77a05d5779433abd2cd563304d9741a80b17f429736dfbb86caea

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