Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac4ca0179f98539…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 92efcf322950d4bf09d8d2bb68b8626c SHA-1: baecc0dc83f727f3bff65048b9ca5a78205f9919 SHA-256: 6ac4ca0179f98539cbc13a9492c766649b5b4d68050b9ae399b8f15046c3f848
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=bass+equalizer+settings+for+android PDF link annotation
    • http://gasasosong.com/upload/fckeditor/file/luwesewonesedekatigexared.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/rilidawoletifejotatasi.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/34800602336.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/timolesujosivofupavure.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/kakizogosok.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/fatifosekiwamuzulerigil.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/juvufemoxatowuna.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-11/20210911051708594342.pdfIn PDF document text
    • http://fygl.net/uploads/file/051808207833.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/20993713103.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/95708296655.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161389aab43b84---58146959679.pdfIn PDF document text
    • https://basisnomor.com/contents/files/12221649698.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/54644352081.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/sofefovebabiledaj.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/97756509029.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/39683008421.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/megexanapizunisos.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vqqfjobticn61fdgv5ghldskbm/walinovisuxonukujupatolo.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/65698554021.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/ligito.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81430203902.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/loburewulitemawufixixina.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 10888 bytes
SHA-256: 193444f204e0924e3aaa3665858558b574d653716f028512bb6efec96852fec2
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 17976 bytes
SHA-256: b28cf0af02cca1d316e55176b4ee88878d01a40f39d86313d62db7654dfb4256