Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02dfe2364e0570c…

MALICIOUS

PDF

83.1 KB Created: 2021-10-06 23:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 64297334d491e1e06b7642db313a495b SHA-1: 51296656b04cf55c6c0804c88fded459831a3d42 SHA-256: d02dfe2364e0570c7dc91fd3b8ac727a993f262c0d4da27b32014c1bf8a6e5a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, with the sample containing 30 links across 24 distinct hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=consulate+general+of+china+in+new+york PDF link annotation
    • http://retroldn.com/userfiles/file/93368967924.pdfIn PDF document text
    • http://telecycling.info/files/file/sukaposibeneteravaradag.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/37451304873.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/momodejodofiku.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210906105248_r9jumi.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/72322804162.pdfIn PDF document text
    • https://penal-garazh.ru/files/mitanuwe.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/fosejovomikazo.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/42517957078.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210909114921_lcztoa.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/59363222882.pdfIn PDF document text
    • http://agilesolutions.in/uploads/sixejirematewupaz.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/buvevalizewexozuwidekogas.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/nizenewizizivim.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sezezot.pdfIn PDF document text
    • http://aotmoo.com/uploadfile/files/20211003_074913.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/zetemipirekonil.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210916174401.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/16073661547.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/39384922668.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/xuvid.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/96649094093.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/xipudirejeresasibajolesu.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210901_83775720420868DF.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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 11040 bytes
SHA-256: 2f8851c4801bd053634dda91f3c346a0498c904ddad49b7b97eb0b6c343d14f4
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 18936 bytes
SHA-256: b4591c2f015a9da2952cb52b033293bf5fba0c66d5b4d81ce0c1d20f202fb536

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