Malicious PDF — malware analysis report

Static analysis result for SHA-256 7893d294ee11f81a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0333356aee432f457bfecb398c06030d SHA-1: 41b61ef22812a745a103eeb6f0149bfb1712379e SHA-256: 7893d294ee11f81aeb467e5bb31a6c6b73164802e05f1e83d9f7303bec4d70f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=demon+slayer+movie+free+watch+online PDF link annotation
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/97321186533.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/zegipezijugoj.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/dimamabujisozumiw.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/58871399593.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/51355978334.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/ramukipewumaxunen.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/ninog.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/guwepesemap.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/roranatapawenunore.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/60083767773.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/givexobaduzuwe.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/85544902917.pdfIn PDF document text
    • http://okvin.org/userfiles/file/pawudawunil.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/vovapubepewozedo.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/36891917684.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/jazixabepezofeso.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/25310590918.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/29245578063.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/3544944406.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f45d85f6d86932870b9ea8b7f0b357af/56774659281.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/musixoni.pdfIn PDF document text
    • http://teraval.cz/res/file/52505855543.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/63555006517.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_off0000da77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 17780 bytes
SHA-256: 83467f2c7e578cd942340227f9dd3666769b6b06d7fe090eafe33118d4f9f6f1
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 10868 bytes
SHA-256: 535cc6937178aca1a135e8af3368d0f211d0cf2b99ca34cf61089cec5b2f22f3
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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