Malicious PDF — malware analysis report

Static analysis result for SHA-256 1099808c59afe171…

MALICIOUS

PDF

69.7 KB Created: 2021-09-09 00:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01fdd8fab854d028a46a25bbcfc5c497 SHA-1: 10af26233e1d0d86c58c3c6a92bf822210bc30f8 SHA-256: 1099808c59afe1712bbc978b75ca2630cdefa478e8d103e03d53713260496fe3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may attempt to execute malicious code or redirect the user. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are unknown or potentially malicious, supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.santaterezinha.com.br/js/ckfinder/userfiles/files/19095202994.pdf In PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/49630540596.pdfIn PDF document text
    • https://atavio.ru/files/file/lanupejapinavogobitupupef.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1027djk6b0u483drilf7lp9omv/2726163113.pdfIn PDF document text
    • https://cargotavio.ru/files/file/7302992141.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/pobogozibidawuv.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/dogelunodavexumatovona.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/99408857921.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/bapimilefitodiralu.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/48378193027.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d7c3a3d423545df4215a14c36d1c9090/18961326066.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fexelomuledapifejoj.pdfIn PDF document text
    • https://akemi.ro/hirek/file/lelotibovorivezat.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/jotuvalugizulujopejo.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/40733165204.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/47591193439.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/kugolodo.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/pejuvafes.pdfIn PDF document text
    • http://gestioniarmatoriali.it/18765442262.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/72644654166.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/pafawiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=power+vpn+mod+apk+2021PDF 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_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 10688 bytes
SHA-256: 4a232c354ea0ca3d17f7d5f1ab207a8465008acd9dc5d598b0007275c026ed6b
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 15676 bytes
SHA-256: 2a510d5562fddb354e091c1a027f40e8ab068e60eee05c51a7745a73d8c90217

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