Malicious PDF — malware analysis report

Static analysis result for SHA-256 b039effbae77e50b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b831489d4f879037de1da0db8d3f2f9 SHA-1: 367245757bf6c3818cb49f1c6c5ac013a074e9ae SHA-256: b039effbae77e50bff4741a77963033d7a38ec7c11585d668c156d82759ab7ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and numerous unknown URLs suggest it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://khambenhxahoi115.com/images/files/31178558545.pdf In PDF document text
    • http://moscowballet.ru/userfiles/file/6349019708.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/81232490903.pdfIn PDF document text
    • http://mp-journal.com/media/file/1266708388.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161401b62b40e1---41258900036.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/36787753928.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/napakisaduwito.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/29659674548.pdfIn PDF document text
    • http://horvathortho.hu/tmp/fawanevim.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/poworuvowodesano.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/56940606345.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/90018183763.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/47278882673.pdfIn PDF document text
    • http://katachizu.com/img/news/files/30005401704.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/samilobagatodalotose.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/nikanulezigarijebi.pdfIn PDF document text
    • https://megashina24.ru/files/files/paroxaxaxuwilufitebidaw.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/65810087772.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/29394495245.pdfIn PDF document text
    • http://mqskin.com/luutru/files/23659834135.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a4668676---57611940839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+fights+online+freePDF link annotation
    • 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_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 17872 bytes
SHA-256: ef6bc0036f005c726c006cea9c496ed51e4f93be01af3176dfb5ac639ec2e61d
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 10608 bytes
SHA-256: 6d8d24b98c9df94e908dc57b27e1bb52727da2fdbb567e5bd4544f5845fea306
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.