Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e52289b014db54…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 09:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e031caf8063189f69b25ef3998c75ff8 SHA-1: 39ba595953d27c1c7b707d91a4e41e4d203cef6c SHA-256: 59e52289b014db540e6b22abc7c735bde7741898e5e126515d42c9469fe08c9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, suggesting a tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://smidgel.ru/uplcv?utm_term=sprinter+unblocked+77 PDF link annotation
    • http://udaybharat.in/ckfinder/userfiles/files/50803083904.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401f98a41---85473204239.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zunujixusovonuke.pdfIn PDF document text
    • http://stroi-sistema.ru/img/gebepuworagevidovan.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/xuwinabomiv.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/xozopuluru.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/72811274238.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/48098799137.pdfIn PDF document text
    • http://citra.cl/userfiles/file/67215656010.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rovowevasef.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/17593957093.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lezarodubirigozurawom.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/vutotasasilukeluk.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/29204043961.pdfIn PDF document text
    • http://abc-tel.ru/data/File/fowagadunoduxabi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2574278b---bexojujofunizi.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/78657036327.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109122253299158.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/32480979782.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/44856559789.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_off0000c672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC672 10632 bytes
SHA-256: 766865da514e6158d1a236d1f6a4fb3674b6e27b038f23116fd22beaf9f92abc
font_01_sfnt_off0000deaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 18460 bytes
SHA-256: 49e7079f5daa0f8ab520a1f643afe7ac001dbf0b5fd63d61b33fbfa3c17ba512

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