Malicious PDF — malware analysis report

Static analysis result for SHA-256 247420dc78f15620…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 15:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0aa6217a0490b6e9120db8abcb84953a SHA-1: 98f96ea4de2919f75f843e8bc53af62e676df251 SHA-256: 247420dc78f15620f8220bed17233ca2c4c1e1356f26e6027d55fe3a61b6d62e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a significant number pointing to a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting many links on disposable domains, suggesting an attempt to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded JavaScript and linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://mokhalasati.com/userfiles/files/wakaxokowozuvigulivikap.pdf In PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/88016962305.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/95941841572.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/tifedimovotujusufege.pdfIn PDF document text
    • http://lulanjina.net/upload/files/66364991141.pdfIn PDF document text
    • http://gibisch.com/files/files/sizebezananuvolazoz.pdfIn PDF document text
    • https://qnzar.com/files/webofanosutaf.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/tefaxinezeboxi.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/67573446457.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130a129a5a77---dekoda.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/kezudozifebinikaxolorov.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/80092857417.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/sokemiba.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/47872164175.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/5594473025.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_230926.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/2424604552.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/38727901531.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q81nifi4mounajhhphiq5tpa7v/zuxomoluripefumeg.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/xovalerozunewiv.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/xelodalimejewel.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/sakonamemetu.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/wodexijelodaresanisosubew.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/81838572895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=crash+bandicoot+on+the+run+hack+apkPDF 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 17760 bytes
SHA-256: 136cc3a4f4a1231a25cb6cd4cfe842bace0adf3948d5f527b550c6333f597d17
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10928 bytes
SHA-256: c309c1fb942e4d456eeb9fbcd8fd5661f1c41b5f4b599203436587db4f308458