Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b58556979484f0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 02:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a8c5aa6e776fa172854eedd73208ddf SHA-1: 54fc6cbc9ec93566df94705282c7762f7a823ae5 SHA-256: a0b58556979484f0c713baec8144773115d31d9d7e2e621529997a4b0dedeb4e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate an attempt to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=how+to+turn+video+into+mp3+iphone PDF link annotation
    • https://h1t-url12shio-turbo.com/contents/files/novinup.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/38938951525.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/tupudelidaned.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/kamesimemovovux.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/62675565443.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/doxinipofoxekefipa.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/76929160136.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/mafujum.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/girikinozone.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/68772402009.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/82216262492.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mupekuvezasilo.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/93659371049.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/48597384975.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/popelezagulul.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdf9141fb---12947397718.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af66de20e6---majisufu.pdfIn PDF document text
    • https://endobible.com/userfiles/file/23195425535.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/14798596159.pdfIn PDF document text
    • https://n-tlg.com/files/file/80395695969.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/sodiri.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/72611094229.pdfIn PDF document text
    • http://pinxedien.net/upload/files/27011161609.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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 16124 bytes
SHA-256: cfa02d922359763bd8e3e84a46c41a42383f39fe36c129682cdf639428e88076
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 10696 bytes
SHA-256: 838ce52804cd8c2a19985a92448f94f839047be06e2011d8b568104b3b1289ea

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