Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbc213a623c46e5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 00:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21291a064d1d92cd17683c7abf1c4ce1 SHA-1: bdf052d38ad74b14fdaa6afd56e12944b3ab6f51 SHA-256: 3bbc213a623c46e55855345e6f4c3fef83b97cd733b93533719c98ef4c6b428f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=bird+stages+of+life+cycle PDF link annotation
    • http://zsmnowakowski.pl/userfiles/file/22756802514.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/namikadonaja.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/fadafigunexejujule.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/nakug.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/9249400606.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c17f5f7fe---94363349302.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/safamivewitifutuxewo.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/11496498858.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/kegovelatiworo.pdfIn PDF document text
    • http://ilkemymm.com/image/files/nomodumonuxebu.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/87223786716.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/mopewufodid.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/1243561525.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/69044860669.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/55033759455.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/simerabibojaleromiduludod.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tebod.pdfIn PDF document text
    • https://dm288.com/slicice/file/76028181532.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/menexanewararexodo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210912_172234.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912224024.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/duragefa.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137c93a8a505.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7aedba2ae---tiludagalitafurugolubepam.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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 17220 bytes
SHA-256: 780bf44cd8179df07c9348c3dad8d692831610818b26255730318f455a505a6c
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 10716 bytes
SHA-256: 1551d69a44911cf18dd46346be975f03d8ac331718398927d29c938a8ceb444e
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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