Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9702c56dc439d18…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 15:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9974f93aeb79a42803b50fe9e6ee8ff SHA-1: 5e0c2f1cdaa0d234201dabf319c48403e07c1f3b SHA-256: a9702c56dc439d185cabad9fede86f57ce6f3f037e4ad156de83fcabd1cccf8f
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links, and the presence of numerous unknown URLs suggests a redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dajuicebarus.com/uploads/files/48228945537.pdf In PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dobutukof.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/milivodovowizepadipiv.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/viwusavusefakusitida.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ecff264803edefdf5cf9f01c6eadfb1f/fojesuju.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/98430424199.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/26107370580.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/89244913844.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/19807395545.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/lebotajanefegu.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/piritomafazugubi.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pafapulonajasamipaz.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/20566254809.pdfIn PDF document text
    • https://akconta.com/uploads/files/rotimusiguwofilefizamete.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/sojixupefamotulorunizu.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/8489458254.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/4437142490.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202195257359264.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/97939036168.pdfIn PDF document text
    • http://falconltd.pl/cache/file/94118284090.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210916113522.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/tulodokitulibibizej.pdfIn PDF document text
    • https://repo.xposed.info/module/com.balamurugan.pokemongojoystIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pogo+joystick+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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 10504 bytes
SHA-256: 8ec40c060d4e58ac4c2feada9c471af2679a4fbf7ada5bd52e8b2af257f29df5
font_01_sfnt_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 15908 bytes
SHA-256: fcd0259c4c20920f17d285bc42215e9e8d01113fbbead63cbc4c6ea10e8b176a

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