Malicious PDF — malware analysis report

Static analysis result for SHA-256 a596e5b90e53cca6…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 23:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7069aca386ef5cc8affd2f573606f66 SHA-1: b4ef509e4923235ef38f925a6d2b70d135dfab43 SHA-256: a596e5b90e53cca69567a06e71ad40485235211905e9d5b84995de4af4a396f8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=if+i+could+fly+violin+sheet+music
    • https://steklo-shik.ru/userfiles/file/sowejusakal.pdf
    • http://deepakbatteries.com/uploads/file/xedajosonejafotufopemele.pdf
    • http://qishuochem.com/siicea/userfiles/file/82554627797.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/ritakibuz.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/jovejidok.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/sepaputipujulosarelupivi.pdf
    • http://net-marketing.hu/images/files/47539857097.pdf
    • https://edusfera.pl/upload/file/fumorumitimumabe.pdf
    • http://strap.sk/uploads/files/21389164456.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161409a8741e71---wowifejoxufolosujawabuzev.pdf
    • http://idroter.org/userfiles/files/werexitakidu.pdf
    • http://happysmilecard.com/uploads/files/85795640769.pdf
    • https://granitabrasive.hu/editor_up/mitidavebitazapowepov.pdf
    • http://slmj8.com/data/userfiles/files/zowobisugulo.pdf
    • http://tano-cable.com/d/files/fitoxigo.pdf
    • http://collectifff.be/imgdb/accueil/files/84960050389.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v658q2s3ko1ht6ftqkqcl8cc41/tunigoxezalobif.pdf
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/romobupu.pdf
    • https://usgcambodia.com/userfiles/file/zotetu.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/30209326553.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/bubamikolaxamidafi.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/datapefituzajiraka.pdf
    • https://tyko.pl/userfiles/file/jilebitozakaxirajebagovi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d041.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 16792 bytes
font_01_sfnt_off0000e853.bin
36b451aa6bf99da088874bb842557f5fe0f1360776ec0241fa3585e9017c4998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 17308 bytes
font_02_sfnt_off000114de.bin
2698d555c08d57861250aae8211e5f2b5996dd7f4280ae78d417df662ab47e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 10712 bytes

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