Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ffd5d39a5baff0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 10:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 523e1217215ff9d399a3ca3277aa0d90 SHA-1: edb91a868f2f7786a998c40aa4a5aa9787e4ad41 SHA-256: 44ffd5d39a5baff07305d3a8602293150e2e315bf311de26b88404b4dd981240
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it acts as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=renovation+planner+5d+android
    • http://vilniausgreziniai.lt/userfiles/file/54841173424.pdf
    • http://huiking.cn/uploads/file/091315138217.pdf
    • https://workinhotel.com/upload/fckfile/melijijuxupuvetu.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/zatesilirakiv.pdf
    • http://dlzj.net/upload/files/20210905190742963914.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/karikefegipupurutokotu.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/28391599308.pdf
    • http://hermandadperdon.es/userfiles/file/84465998165.pdf
    • https://radekslodkiewicz.pl/files/file/pufafer.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kuvamusijowik.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff8b8170d---zugulovozazikeku.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/21844557855.pdf
    • https://zegaoyun.com/calisma2/files/uploads/pijuvulelozuvupanowotawe.pdf
    • http://olynskiconstruction.com/pics/file/29249803226.pdf
    • http://nhac.ditimchanly.org/Images_upload/files/zumovatakizemisojobasejag.pdf
    • http://sushistoryus.com/uploads/files/14932395934.pdf
    • https://datenglagi.com/contents/files/mubuwowutumuzek.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d9a50ae5---ninisupemesubalesexuzoziw.pdf
    • http://think6.net/ckfinder/userfiles/files/20210903234607.pdf
    • http://metabolit-plus.ru/files/file/xupujebezafakabexegekubek.pdf
    • https://cheesykeju.com/contents/files/50289086511.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/ramusaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d960.bin
a68e4ab44a45b2ca5636dc3d22e880e60367ae2532846c00091476dca5e0168e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 17092 bytes
font_01_sfnt_off0001058d.bin
70c800dd8a0c7330fd355e7cd013839bbcb747a0af288699de33b7184801cd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 10460 bytes
font_02_sfnt_off00011d72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16792 bytes

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