Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda7fc0cc61c9aa…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 07:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72934c32ceae16c4670a89668f6f9aaf SHA-1: e80ece973bd9e2719ca34f4d49768b2d04bbada3 SHA-256: 3bda7fc0cc61c9aafb10f822ff3dfc088f7299fd5b1d4e1a3666aa1fc85ed1cb
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically targeting 'earn free robux sites', suggesting a phishing or scam lure. The PDF structure and embedded links indicate an attempt to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=earn+free+robux+sites PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbeea99e62---71976151315.pdfIn PDF document text
    • http://labradory.pl/file/jabejuzenelofaludilotumul.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bc68ac2b---lezovuwaxowuwinoxuwutajuj.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/51418175566.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/11297682437.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamixirowekafiti.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/kanutegatogigumabixedatax.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/ritodakenaramib.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/dutufomofaxudip.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/pipuxifoduvepox.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8853675551.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/kijitet.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/89585989679.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/78543015756.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/56550056273.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/39351207643.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/99501996465.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/31551378566.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/45966617721.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/futuguvosogodenogevibil.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/5024509392.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/81608938694.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/32526632707.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_off0000bbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 15896 bytes
SHA-256: 5dee0afc53e849efb71293287b09afb093f720a3ad1a6a949ae2ac800b9d07cf
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 10484 bytes
SHA-256: 2c5d01ad9d03efd061f42823e02bbe7dbcd2c732881daaa3741883edfb538b6f
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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