Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc7b477344bfdd7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 02:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 985bcef1c6e3d4814f877d2ccb41836f SHA-1: ceef083509efb13b817b63574893a07e56a57ae7 SHA-256: 5dc7b477344bfdd7f7851436ee6a60a943802f239f7a43b45e57adfb4d0e6598
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one with UTM parameters suggesting tracking, points towards a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host many links on disposable domains. No scripts were extracted, but the overall structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=american+horror+story+season+6+watch+online+free PDF link annotation
    • http://wksystems.net/HotelEstimator/userfiles/file/pefusetagexu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pikidenene.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/furugerubozenunigebe.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/30592663996.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132a18a2b8c2---buxepeno.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/gawogid.pdfIn PDF document text
    • https://tckontrola.hr/files/17024881360.pdfIn PDF document text
    • http://geneolock.com/locktactyuma/userfiles/file/vipivizumo.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/xawunuxadigaw.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/77877398990.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/36184089960.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/8451664595.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/8752038708.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bokafumoxepako.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/1849341054.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h46he6qkvvhr9tnsfgcgonb7bn/12710989305.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/meditubuwo.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/64866315325.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/37602539809.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/90932776944.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_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 16852 bytes
SHA-256: a02ffb11f82a75d87551e262e2730b377141605723e02f5c261cdb5076d88c6e
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 10948 bytes
SHA-256: a86c46a0978598bef96eb692cfb097c216e63dd3bbd8283e7ee8bfd820152cc0

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