Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f157aff153f3e2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 03:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b05d5c3b977dc784224087218418b18f SHA-1: 3085c9f5dd987432df463bebc57d529def25a37f SHA-256: 70f157aff153f3e2aacf64d352327385ba6f0762ac242230244b6ce57ff24cfe
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The presence of embedded JavaScript suggests potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://wastran.ru/uplcv?utm_term=srt+editor+android PDF link annotation
    • http://sungder.com/upload/kaxadu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/77538030856.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/32178342484.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141394a64080---37312351343.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/moribobopabemebawuzum.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/kimozeg.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/sabaxekurexade.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/liguxiwap.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/9249494634.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/75543808314.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/guwinowoju.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/damatogul.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/83389120756.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4c869a992d895edb53a0528b82bdc020/84732687653.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xakumejolexajeku.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/27828098537.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/86090205730.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13250988142.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/91885036083.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/fibenofazikutuwabutos.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/ganufabimitesubidiz.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/99985565439.pdfIn PDF document text
    • http://qdcmd.com/data/files/sumomejededogenu.pdfIn PDF document text
    • https://mavibusiness.it/file/34218874947.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/31634095107.pdfIn macro / runtime command snippet
    • https://retrofitoman.com/ckfinder/userfiles/files/48675930746.pdfIn PDF document text
    • https://mavibusinessIn macro / runtime command snippet
    • 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10100 bytes
SHA-256: 4c950da1d3bbd8cb6cd674d71e23bf07993616304a9d57fcc81e7cae404cc236
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 17484 bytes
SHA-256: 868c77fc5db2950d8ed683f8fe74c1d63336f2e8b197053e9fb37dda3ed12ae6
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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