Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e1b638e47a2496…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 05:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1770cac1dcd269aee544ec1aec965036 SHA-1: c2352dfd7067b844d54f0e9c2b44a7df0cd7cc5e SHA-256: 61e1b638e47a2496111227e227c534e892c0657b41d968ac73bd193c1fb70cc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to exploit vulnerabilities or redirect the user to malicious sites.

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://hargagila.com/uploads/image/files/53348016809.pdf In PDF document text
    • https://curvy.tw/upload/files/9079979407.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/6857074907.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/jajomosuvalimu.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/88353759075.pdfIn PDF document text
    • http://seritour.com/rsm/files/pekatenevef.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pejibobonagujonu.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/vaxinateg.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/61156907727.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/pesiboluwojoganetazo.pdfIn PDF document text
    • http://elpijisystem.com/file/damatapojiwabagusumagawo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e58ddc13cc---27059574024.pdfIn PDF document text
    • http://whatdwellswithin.com/file/sodozekurarelifugoxos.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/kerunijipezadidolizun.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/21223220698.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f991e8ffec---vafovetedadatejiva.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/73978380519.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/ronoxufufeloluvozak.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fikuzurisixuxeno.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/39665390842.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/tinipemebefi.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/2876522860.pdfIn PDF document text
    • http://agama-rc.com/upload/files/4521988571.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sogenotegasogotase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+xbox+360+minecraft+seeds+2020PDF 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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 11468 bytes
SHA-256: c6eee2af5ee47179c8630a69d061584cf3a7e9f9edfece13aef5fb658c1598b4
font_02_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 17396 bytes
SHA-256: c4cf7a9c61ccab83a9f48cdf8c2f3d10c21474f49a7f7e90315ab399d231ac77