Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75a24250e367828…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 02:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41373d22c4707efe3be71aded19274e1 SHA-1: 7aec081b55fc7f7f5debb4776c5345fa157d6a86 SHA-256: d75a24250e367828cf1fec40ed0e859b1614f13950bd4d0941c464fba4917b68
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final malicious destination, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://panda-es.tokyo/yamituki-n/uploads/files/11360563217.pdf In PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/vujegejitaxok.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be598885da---pagazasanon.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gigamuzebuforidavewumu.pdfIn PDF document text
    • https://nls.vn/upload/files/27966657706.pdfIn PDF document text
    • https://gulamanis.com/contents/files/dulibenukujow.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8373382d0---jikusapinikunaw.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/79996988114.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/94508454475.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/jupinifazab.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/rivanedebab.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/mojotuwilupogizeriferase.pdfIn PDF document text
    • http://prograsifkalip.com/files/dugimetamenije.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/duzerupapimaf.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/kukubuxamokikixok.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910085135110197.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/43500252349.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/73756017473.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/letirufutalimapinorivu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dupiremutoximanalajelix.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/41441562682.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83738323888.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/vuropamav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdf+drive+think+and+grow+richPDF 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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 17972 bytes
SHA-256: e88a5d1155d97c75434c49111f65db01cf03e30b56081253cc5dc99fe86ac26a
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 10788 bytes
SHA-256: 3e0d7353590fec55aee1fd62534b8ff8e8b715b840d8fd4aadc9b8405c32f8eb
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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