Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5d2aaaec3470e9…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 09:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47a6348200a51dfe0a8453a2e2cc8f5f SHA-1: 1370c2b74e735a395a0fa3a47a9ef467f257d775 SHA-256: 5f5d2aaaec3470e9f5d8d11cba9e4ac7e2a721a0dd6d1a131f03616f9bff7cd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URLs, including one identified as a link farm, suggests an attempt to redirect the user to a malicious site or download further stages of an attack. The embedded JavaScript is likely responsible for initiating these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://alnadaoil.com/userfiles/file/25700902290.pdf In PDF document text
    • http://laboratorioshamalab.com/userfiles/file/fuzofuvapufuvupujasaj.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/puwejeko.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/wagifedojebipurugivob.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/kuxuzepuwerijipopag.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/tomemegogamo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/32715225234.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/gimojijososibi.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/duvowovaromigamelonopemat.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/25518516738.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vodimopilexuwo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/33090420755.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a70fcdc1eab025c486ae88216e533739/jawawo.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/jitodidovofimivonasomegod.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/27087142204.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/nezotiwavifidomewepu.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/zoromovigi.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/21201814603.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/gixizenobedev.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/gulugiwiwuregevotajesewem.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/80501722053.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210908124616.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea81c229fb---damuvifonakovu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rpdk7ei1ub473kn2vr9e7fpq39/48104463554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+design+login+page+in+android+studioPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/2584854028.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_off0000b9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E2 17340 bytes
SHA-256: f940b8e1cab8304c749f7f5f4d47f12bf7b8dd4d422a7b0bdce190f8cddabe55
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 10744 bytes
SHA-256: 8f4b519fd8beb50f5c13272e54655c0ddd6646395b730414a70184c475a2e0bb
font_02_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1