Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a83d84f34f64cd1…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 12:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de206634a4541ea47eadf1c84f1bf835 SHA-1: 87edecd5f9fbbc8f8132f8dba06596c0cdbf6d62 SHA-256: 6a83d84f34f64cd11e7fac25fe11b82e795adbdf7cf374b17f0b05229a307817
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=android+1+injustice+2 PDF link annotation
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/nabodorudolebufajo.pdfIn PDF document text
    • http://eva.am/files/3c7ef728cae16b9b.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/sutesuten.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/mupogenugobesivo.pdfIn PDF document text
    • http://poiskvod.ru/images/file/94435766572.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/nagade.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/bekatifu.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/tazododutudodinem.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/pavaj.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/boxovabavavik.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/baxamibuf.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/tevotire.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48500428565.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/muvuxeleb.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/buzenumixi.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/dozaz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091107505435.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/gevofenufake.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/bunujugizikovebotodimi.pdfIn PDF document text
    • http://vitrine-prof.com/files/xabujopewutasola.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_220233.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_70731759CEFA76A8.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a9d5891ced51410856172cab964c3f2d/ketenebalubazetuzala.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_off0000ba7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 10540 bytes
SHA-256: 65584b8131b1495a8f63f247907a8e84a6ebd7783856219446a03298fe21d581
font_02_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 16496 bytes
SHA-256: 001d9ccef9bd218b2fcac75d8ad69f2a9568681c51ba886fb859384d78388c37

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