Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee7deb3532aead5…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 15:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b23145b14ae7f99ce2656a461550a95 SHA-1: 280fb0a972e7e009d119b4be6d22bb134f43f43c SHA-256: 6ee7deb3532aead54287810ef2a8ea6a1cb099c9774a7ed91305b938c563abc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, but the presence of external links is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xujukatosul.pdf In PDF document text
    • http://unseretochter.ch/images/file/81223948861.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea1226e5f---dorojibazuzapovatevoveve.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210907155719.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/rubezuzobirovu.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zagaki.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/gerul.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/5508768739.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/96046714465.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090607512728.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/91975512671.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/20744184511.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210910_7581EE3C329638F7.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/xezofa.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/92406111323.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///nagamaw.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/27565229970.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-12/20210912115054574242.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nuligezefugemekanexep.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631246183.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/susimorafamor.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/nivuvobu.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/zupekananisaxapepukawuse.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/10215401569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+launcher+for+old+peoplePDF 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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10776 bytes
SHA-256: 4ba6176a28b19180d60c2007a82d409f2b6fc63b2eb8efc236679f850c7cec53
font_02_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 16768 bytes
SHA-256: eee940728e283e81beaa15ab7366b2f3905669f1bfdf5fd7a355d5290fbd5a3b

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