Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48c70757627ce0d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 16:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6283daccdaa640c739ec7d4be6c6f956 SHA-1: 5dc900b4ece25bb70b5357b1fc7c311a85a4fa26 SHA-256: f48c70757627ce0d002ba6e06a938ef23c1975a83a70bbfa0db3f1df0921a205
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bititechnika.com/uploads/file/terojasul.pdf In PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/11985050448.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/21837736299.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/19446635748.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3928089024.pdfIn PDF document text
    • https://tl-systems.hu/files/files/57816900357.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/77156509589.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/50820434489.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/tapafasokebivaguja.pdfIn PDF document text
    • http://wawa757.com/uploads/files/memuzogexatorekowifub.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/12548677517.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/39679893870.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/66767190504.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nuzekujudije.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/39721936816.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa97afb5c---gevefi.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/26359891755.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/madurivudomoxaxaketas.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17722309000.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/44468880549.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gmb47s64jbd4iuhu3m1cmv7frm/23295672731.pdfIn PDF document text
    • http://snft.ro/media/file/zarawipukujomedeloneje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gaming+screen+recorder+for+androidPDF 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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 10712 bytes
SHA-256: 95a843cc0296ae00a7ed651a746e52d0bcbd5a2f1b99aefec193d939a54a5946
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 17900 bytes
SHA-256: cbe9b8ececc2d3d2a5fdf5aa95049ed60a738d7229116ab97cff97d9439d7047

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