Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1963cebf7a038ae…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 09:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01d629ed3e30a9b64e8b05886206002e SHA-1: 95ff1fd4819fca55b26532fcc62be9818430b085 SHA-256: f1963cebf7a038ae3a4c6908074cc097f425271350600004151b0e60da067c13
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://phr4u.com/files/debifubexeto.pdf In PDF document text
    • https://whitesal.com/data/images/file/2082_20210912215744.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ddceb4df---75313220200.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/10890650018.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rawoxume.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/11699019453.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/8381453735.pdfIn PDF document text
    • http://planetamama.ru/files/file/8445678258.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/josonolekixava.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/magudaputubuluvit.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/84487789104.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/voruzujexedevasadejuxi.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/58179006527.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/26118720953.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/wever.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/68577392465.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/20176355732.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/mekaxadokabuxojimo.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/fesubi.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/59744078453.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/63712789684.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/32278523750.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/32103162358.pdfIn PDF document text
    • http://01host.ru/userfiles/files/26394201530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=making+name+ringtone+with+songPDF 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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16652 bytes
SHA-256: da16b8a88f9eb9d1d91e452cc9e7646b99c11ac502ec93669b12c985b8b7e9e8
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 10680 bytes
SHA-256: 6fa10e64f01d322a23ff4597a3a16fb315f5e5a878e737166503b26d649c4699

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