Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea37c11111122e1a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 13:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50459f4f15e08262e831e72d5f35ade2 SHA-1: b1aead7096c76574c810de9d9dd4a5d3a7bbfefb SHA-256: ea37c11111122e1abcb9a6fbba39de1e58b8f1b5d6dc0c85513466ce9551e80c
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 hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for multiple links. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests the PDF is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wemservice.com/ckfinder/userfiles/files/wezigijodapivadozi.pdf In PDF document text
    • https://tecnomatec.cl/upload/file/nidatikaralu.pdfIn PDF document text
    • http://ave-france.com/pics/files/rivuguvadifoxajedegubile.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/53652377860.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/31616160898.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/divuvavefawibulinalogafu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381a454bde0---56358807268.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/llnc6e2ocsesvhnepmc9bh47nb/zejewekafemusugabobelon.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/rabetalojedewimom.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/sidufe.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/bipojufe.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/duzebebapar.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/fasesew.pdfIn PDF document text
    • http://brenderup.ro/mm/file/pegisajefabusima.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/mujixujerilofiji.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/48061781791.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/napitaxe.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/fevenitipazowoxilemevos.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/josuzu.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/6420475118.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/rofef.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/39309761272.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/saxasubegojaraxax.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/53207292160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=insanity+workout+download+gratisPDF 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_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 16832 bytes
SHA-256: f8b874976445a40fbb4ee108b9a75043b6b92d10c238df39d9dd807266620003
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10632 bytes
SHA-256: 8f49e216e4d3d99b1f9190545fbb9a81d7e0192f31fdce350ce8682b3b5a64f6
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1