Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8056d6abc24ae5c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 14:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 74c364dfec82c3fd592c88cf81f68d21 SHA-1: 407fb20374efe4bedf71ec7df75092acfeddf7d2 SHA-256: f8056d6abc24ae5cc13565d6fb32b6e5cda760337699d890ba16b15e19f0869c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to suspicious or disposable domains, consistent with a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting.

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 https://rrr71.ru/upload_picture/78567430097.pdf In PDF document text
    • http://linkingpeople.info/userfiles/file/duwiwi.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/74223671853.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/wenefigefez.pdfIn PDF document text
    • https://endobible.com/userfiles/file/39330300107.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bonetimaxufof.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/ramatemet.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vorunurilinakixaxolinedod.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/nafezusonomulaperidajuzud.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/lamekisagekesetasodanifir.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/69817147808.pdfIn PDF document text
    • https://dm288.rs/slicice/file/sezeridemudobaz.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mapefixupamapipuzobopaxu.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/saxosejirupoxaxinopokame.pdfIn PDF document text
    • http://partnercable.hu/files/fesewilotaza.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210904034614.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6153319cc186f40ed8e3951d6c96bab5/bofipanijukokok.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/86151377047.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/5034619257.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/21706944596.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/41704983573.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/8379284247.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161441a997f2f5---91159360974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=real+cricket+20+full+game+downloadPDF 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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 11216 bytes
SHA-256: 03efc39372f4e046a079ff96d04687665647634ec19d8dfebecef0d9481bb920
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 17720 bytes
SHA-256: 8a49da8128ef8685208088abc340e3452d1b75ea2ee26abc360dbfdfeb60ef41