Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2f30d316679d56…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 03:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d713c0f600378a1c54e9e248088ad8ac SHA-1: e852bcc21ddb2353d12aa5d4bb188192cf38cd3e SHA-256: ad2f30d316679d56d0097ec384febffd0209ba5846864718e233f8436cfd2eea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=blue+bucks+robux PDF link annotation
    • https://noihoithanhtuan.com/media/ftp/file/bemepuvebivoben.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/509292904.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/46199276138.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/subakosotarivaxabowadaxas.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/35269729073.pdfIn PDF document text
    • http://ccadl.com/files/20210909061708.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/52422068289.pdfIn PDF document text
    • http://meskerjager.nl/media/files/notamokowigazogefeneledo.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/40669925702.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/9261845775.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/33442474156.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/95330efd86ac216e70accbf86038a607/baxapusivaxosituzeruraku.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/dejedakupi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/purorejokopupodaj.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/40394308827.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/zufiw.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae062703b---kasefu.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/35120921682.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/50646650487.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/42277177523.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/52193952422.pdfIn PDF document text
    • http://adice-area.com/pictures/files/jotewugaropebodije.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_off0000bc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 10252 bytes
SHA-256: 013eb3d4b4d0b82d7cae18ce9ae8d4bd3766fe2e2c4e38dcdc48354ecb62a032
font_02_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16240 bytes
SHA-256: 70cb65dfb8827e671e672deb405e37426fa638ff1c0202503d11a77b69fcbef8

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