Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be25854723d4201…

MALICIOUS

PDF

94.8 KB Created: 2021-09-09 00:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf5ee39fc2c6a7e01ed9b00d54ec6ce4 SHA-1: c89d11c44ba714597fddf31f59223b1b00eb25cc SHA-256: 4be25854723d4201f19d69b6a12a98ef8b170e68565329a456dd67e694204694
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=parts+of+the+body+tummy PDF link annotation
    • https://mimpishio1bet.com/contents/files/torokedanesopabokep.pdfIn PDF document text
    • http://boldogelet.hu/media/kavosanexom.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/3861313999.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/pulogimekikovigaganalawe.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/lebijavufolirebori.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/57084546461.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109061911205542.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/63130034125.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a059fab0---jomegiredata.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/nuxadedubafa.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/5812378433.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/nizawekigoluriviwu.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/xexipagasumuzazegixetewu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/kabasokadopozuteba.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/fexiwavuxojoporaxoju.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/rebarep.pdfIn PDF document text
    • http://belv.ru/userfiles/file/durav.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/29070723292.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/88277326857.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/56169902057.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/xarozoge.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/94406691502.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/mizobejozupuwiludurimaro.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_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 17596 bytes
SHA-256: 5c541ab35e2139f37095975b76431921d8c70f85508a45cdc65c45df88cf0079
font_01_sfnt_off00013c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C99 10732 bytes
SHA-256: 19e1adbd103bc15dd202d16443e05a4c3f50774f65cf319d4364704ec489a759
font_02_sfnt_off00015558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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