Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe62a947fd363f4…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 12:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2194b6e413cd4094b123d8326b4e28d8 SHA-1: ed1dd52a0a91914b3be4bc6e6ef7db3e2e07c35b SHA-256: 9fe62a947fd363f4e6df18df5bee49d2179adf9a43e2fc04a0f1854ec8ba7340
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of many external URIs suggest an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613034acd656a---sagekugezesoredimosilaf.pdf In PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/36496277072.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/niweroborimosafos.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/jonilekutez.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/974651719.pdfIn PDF document text
    • http://klpa.net/userData/board/file/gewaxesafu.pdfIn PDF document text
    • http://naso10.com/userData/board/file/nodiliwunep.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/54539046111.pdfIn PDF document text
    • https://grouptm2.com/contents/files/jedodi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147c26841a8f---64273030643.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/45612523747.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/56749563727.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109231446126597.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/lixasin.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/wekonarusafu.pdfIn PDF document text
    • http://land89.com/ckupload/files/86796961909.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/68058505312.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/13057366768.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/66152795379.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/55638039148.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/sifipulibanoxebudosokek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=parallel+app+assist+apkPDF 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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 17320 bytes
SHA-256: 85356db987ffed4e7bd79ccae4667eb38cbe27d70f244374ea3dd002212c87cb
font_02_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 10116 bytes
SHA-256: 927e3b89f1c904c48bfd2b89743e3d1737ba837807aed2ebad8bbcb330bb96da

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