Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cad5c9233fa899d…

MALICIOUS

PDF

97.1 KB Created: 2021-09-22 19:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0759643788dec7c1debacaf0555bd73 SHA-1: 9ff8c36f9baf15bafcfdda5adb2ffb721e3e7ee0 SHA-256: 4cad5c9233fa899d9bf5ed455537df990f8a221979a83c19c61c3ab3cc3cabcb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use as a potential exploit or redirection mechanism.

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://drafthe.ru/uplcv?utm_term=hp+lovecraft+at+the+mountains+of+madness+pdf
    • http://malabarisproducoes.com/arquivos/files/45437718866.pdf
    • http://retailcop.ca/files/67543015606.pdf
    • http://bachtungcompany.com/upload/files/29545961091.pdf
    • http://neuroxl.com/images/file/87345235514.pdf
    • http://etalentlink.com/uploadfile/file///2021091300564981.pdf
    • http://aktifbant.com/resimler/files/85629024693.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/95890100688.pdf
    • https://skatrip.com/basefile/skatripcom/files/76512546881.pdf
    • http://lab4050.com/upload/editor/file/vovitemudinomujak.pdf
    • http://dailyxedayhang.com/userfiles/files/59745337828.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/kuxosopuligawarel.pdf
    • https://bdata.vn/upload/files/5647440863.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/97083396598.pdf
    • https://sanaspinler.com/calisma2/files/uploads/kufupodalomebawijurawa.pdf
    • http://tw-echen.com/uploads/files/202109140603514638.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e9b3c42cbc2bb52775b10e092be0e31e/37259960160.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/81971413460.pdf
    • https://cemb.ca/upload/editor/file/56419985793.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/67511811877.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jopejisereguxut.pdf
    • https://needletherapy.eu/upload/file/tiwimemirupeduwoxotew.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614229eb79229---71009964774.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111a0.bin
7a08efe40e9babda7a9f402e1f00888258590a1c374d11ab7f6107d86068c876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 11044 bytes
font_01_sfnt_off00012b17.bin
ce71aab4923eb661938d7479ff480f282a153badb5360fac309b46495cb291ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 19564 bytes
font_02_sfnt_off00015e3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3B 16792 bytes

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