Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fe16160f6deb3b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-14 16:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38c84fdac2a3920778a0e97bd7cd7f65 SHA-1: b6e3c464a637d94ddee7f0d9224f889324ebea53 SHA-256: 37fe16160f6deb3bd74c7e3da669cbd84b6f20f01d9f96710f41eb1e8b88e4a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous links to external PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute further malicious content or phish users. The embedded URLs, while many are unknown, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ahlhy.com/uploads/file/062318313472.pdf In PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/xavufij.pdfIn PDF document text
    • https://hgb.se/filer/file/venawugazamazidemolu.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/43309768190.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/fadozevuvitefezobef.pdfIn PDF document text
    • https://datawire.gr/files/files/95594949353.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fac533813f---neputujojezik.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/fapiredawojasovemut.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/1102528670.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/fabopujibapipewamo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/523570cf0f0a9396df030d66b660f703/lebabiloxopazulul.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/10201219131.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/wesuvibodimosepelalojuw.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/nirukovinugemupu.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/14282708412.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/fesemilore.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/dirixivu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/zafumazuda.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/89388240249.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/jugamarozoxonuxebele.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/21649642510.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/jemekorozazafopeneram.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/kisagesawotosilojenezate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=heston+blumenthal+historic+hestonPDF 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_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 18392 bytes
SHA-256: 3fe519b56eba227003cccd6d3988042658bfeed33375f428c4a9008ea2c8b62c
font_01_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14122 10724 bytes
SHA-256: 87504948e4ed4df57d419afcd6790cee36572f7e9a2ff2b54472b5a1f3178c44

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