Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46c82a84dc25cbb…

MALICIOUS

PDF

97.7 KB Created: 2021-09-08 15:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bbff205d13ef829c1182c45dda742eb SHA-1: bbfa16d5f9f818e453174ed70a21154023f7e77a SHA-256: f46c82a84dc25cbbe920a13efcfffd080564cf4343d5668bac0233d191ed13f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, 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 URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://huntic.ru/uplcv?utm_term=business+plan+for+pig+farming+in+nigeria+pdf PDF link annotation
    • http://patanamachine.com/imgUpload/files/64473663267.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/62166310865.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210907_064916.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnkk21i250u5opbrna77gnjrhm/tasidifelawin.pdfIn PDF document text
    • http://hkalc.com/userfiles/16847251994.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/desinigusegipazevowi.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wabifapijog.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/37791263159.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090218243855321.pdfIn PDF document text
    • http://insei.eu/userfiles/files/rexalesixovuguletinuli.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750b080e16---waritujalox.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902033031.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xezagovimefuwotodefu.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/51818982076.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/bekoxukaposamewuw.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/1233092664.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/fiwabuvo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/bipibikomise.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/zulub.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/78548081487.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/65950469909.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/29728121097.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/wanunuwewuzunedila.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/meposujunopa.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/zozikigap.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/99105578464.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_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 10896 bytes
SHA-256: 3aef24b704a8ced9f90d43cf5741cf35c5f6f270bcfdae5776ae2ae0fcc11cb7
font_01_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 18728 bytes
SHA-256: 3b5e01fccbaff35b785b1d8dd2506476a26953d2ce906bc28462937588cdeee4
font_02_sfnt_off00016050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1