Malicious PDF — malware analysis report

Static analysis result for SHA-256 f438400b2f8247bf…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 03:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c5dd3f75dcd8f75b21e5be568a00a76f SHA-1: de4e3dacdf044029aed3b75500b0e9f0ac70c66e SHA-256: f438400b2f8247bf0b0923ef2593d49684115faf4c0dd2e2c640acded2bd1c6d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are often used for phishing or distributing further malware. The file's structure and content suggest it is designed to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=car+simulator+2+oppana+games PDF link annotation
    • http://studiofranzoni.eu/userfiles/files/70392861928.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131af59e81f6---kaluruxedowivilexalu.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/zawele.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/63020062362.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6cf94b74---34247949650.pdfIn PDF document text
    • http://ge-mak.com/files/25741931782.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87627396559.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/19535619990.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_095156.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/99635311436.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/vogavubixipefam.pdfIn PDF document text
    • https://network-italia.it/file/23180930466.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/tivipibokamaf.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/daxufejamovodixumiminus.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gogep.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/64177715941.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/gukokibodimota.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630445089_1.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gakukanitonaxirujosojiw.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-23/20210923054203222608.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/20070564150.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210912142808.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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 17944 bytes
SHA-256: b566dad1c5e922cf36c97b8f08251e39c1b7c84846f824379c8b34f3e4c1cdf5
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 10844 bytes
SHA-256: 34c9cdb90e911110044fad7443d66ac694a935aec38d3202255918a0b536ac49

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