Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e6cb7f02f20946…

MALICIOUS

PDF

93.7 KB Created: 2021-09-20 00:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 490568111f9dbdd9d3a32772c1aa945a SHA-1: 5202429a5912be135c01445098995b58e2d0576e SHA-256: b0e6cb7f02f20946298717813460f9cbede0bdc1bc7ac4ba161f7cbc393f870f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to PDF files on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://heritagecambodiatravel.com/userfiles/file/sipubiwigisibu.pdf In PDF document text
    • http://thefarmatarapahoecounty.com/userimages/18944124436.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210916095241.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/wojotupulofowimafabobi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/pukovaxonimifunodojuta.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/57067076328.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/lulifiwurekotutefo.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/mefipesarozekivuluzasi.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/kivazorafoj.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/73407890216.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133193b07cee---dukokaneka.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bujupugixoxis.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/34248361240.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gupazavomenozijud.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/novekaxeg.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/82925562413.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/jujifebone.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/39415781028.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/xawumomijakudulovi.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/fexosebufumarewedofezeki.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/61275053984.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630551423990370143.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/22937081410.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/57053874956.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/zikaleveme.pdfIn PDF document text
    • http://ned.ru/uploads/files/59379561101.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/63330004143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=live+sports+tv+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_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 18232 bytes
SHA-256: 5c295b7e1fa1754bb492b0652764827fd4909c394a6ffbf4823ab920851e3548
font_01_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001520d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520D 10208 bytes
SHA-256: 9acca328e33895674dd73d70e5c54e38c3fa18e86cb121a8b07a4848eeb0d4fe