Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2353ee7e927781…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 16:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb49fee967d1fd8d61f1a2ee1612a5b9 SHA-1: deff82d6250b71653a0ceeda0a4add730002ab74 SHA-256: ef2353ee7e9277811c45522b77dc215a8d9ff873d6b0c41dc7763a6b75bfa954
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging techniques to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=k+means+image+processing PDF link annotation
    • http://olech-rzeszow.pl/userfiles/file/zujuzoze.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/75089535290.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/70201187089.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6313d22a3---fosatuz.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/lagezokekuxozexakubisi.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/wofomusuximasibugofi.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/rekamimewadipura.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lafukapuzejopafekukota.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/zanejenubivuvi.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/lidekuwobivusujuliwuvibad.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/tijezirovamunepaniwogo.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/51706514783.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pojanagelab.pdfIn PDF document text
    • http://kalikraft.com/images/file/kupumafowa.pdfIn PDF document text
    • http://abwva.com/uploads/files/90023624802.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/76515881050.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/92838617536.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/14140424274.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/jiguxawaj.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/75872927804.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/15c24249532914448cf1297fae428b8a/79228881964.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630776564.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sogaruzefujagi.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/lobodujumosonovexonemiw.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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 19840 bytes
SHA-256: 018bcbdda3092d0c3ebe9ad28d70300b8f1ef25783e548585293104f0f5c3ad0
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 10564 bytes
SHA-256: eeb3b86c7dcb5a49a465d85e5904368a7d5b3d9a7987a233faa284415014bb17