Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4d6276b61070a9…

MALICIOUS

PDF

72.8 KB Created: 2021-09-28 20:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7770d1dfef0b331bb0073101ae9c128f SHA-1: 1074cec4e47e2ce97930c216c25b12e53c15bac3 SHA-256: 1e4d6276b61070a91b5ca5721a82bb1caedf8f86ea5bc39b3da8fa8b76026ae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to what appears to be a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown URLs and the link farm structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://esofagopisa.it/userfiles/file/roxasepirifa.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/39400637622.pdfIn PDF document text
    • http://jucal.es/images/file/39154816896.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d2fa3863---jizej.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/70234821167.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/96005718957.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/36188282789.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/29639686240.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/pozazorisovarugagonite.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/tapujosudojemeb.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210902015306.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/53281427735.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021920455462684.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/36242990679.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/47664278365.pdfIn PDF document text
    • https://shibbirs.com/media/files/xuwezaselipibezodoxuzugu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fa85de4---somuxazujazexupuwo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/95130572854.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/56942981853.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/48439977430.pdfIn PDF document text
    • http://ucokampen.com/media/files/rominuzezimobilenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+light+platinum+filePDF 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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 10728 bytes
SHA-256: e872cfdfca5e7a2086047e7fd6c8069154a2ff8e75f70cced264736183065c84
font_01_sfnt_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 18572 bytes
SHA-256: 48a099cad4e922eac80adc2baa8d89305e1042e2b94da7776158571c2a065406

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