Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8ca9742b303cde…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 23:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c355928d3600104182cd9094c67d3c5 SHA-1: 10b16416e269db3f75b0dd014fc1a170e69d5469 SHA-256: ee8ca9742b303cde4a67a0ddd47f2aab64383f0a7003f8ee075caa3785547a34
146 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to disposable hosting domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.poliklinika-hb.cz/userfiles/file/24180306104.pdf In PDF document text
    • http://showpalmedical.com/userfiles/29912916620.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/59280937587.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/68222943579.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/dokewifepomuwojapupe.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/lazisujoku.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/st15utichfhbspt2r6888i3moc/mogijewopenuvemuvom.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16309985191893085519.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/72502754940.pdfIn PDF document text
    • http://infosierra.es/images/editor/ronuduvowudun.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2b99c23b---dojilejimigogik.pdfPDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/bewanafuzibul.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/8739274834.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/79636561495.pdfIn PDF document text
    • http://wawa757.com/uploads/files/zakabux.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/kekurelu.pdfIn PDF document text
    • http://pedraferro.com/files/files/mekevuwunutiraxoj.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/lemekozujepusolipixokadev.pdfIn PDF document text
    • http://remobudostol.pl/pliki/kidudufixo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f967ba02---10994811735.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902040326899.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xodobevuku.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/vabesilesabisofupoz.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/13866463398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pixar+2020+filmsPDF 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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10264 bytes
SHA-256: 08231c06274bef678e8b61b2eac56a4fee43fb4f3310d3d74416dd3b53060e89
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 18028 bytes
SHA-256: 10628f6f731b5595ba6f62627295877f552ec51e0d28726fd8e01868ad94dc92
font_02_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1