Malicious PDF — malware analysis report

Static analysis result for SHA-256 284bb9010581775b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 11:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6859cf76f81135b636f3d483e9ed21d5 SHA-1: cecde3e02dbc897b680e034498e4373b5acaedf3 SHA-256: 284bb9010581775beb1da0dcfc18f32cd3373388618f6e23e09fa0c7caea8ef0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, with one pointing directly to an IP address, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further stages. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/kijabivegoba.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rafisonagi.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210911025507_1034102331.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_C344EB0FBD26E3DA.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/60418664741.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/boxudakegazagusin.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/98356289746.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6ee81ed7---renorebubizitapofezag.pdfIn PDF document text
    • http://acril.ru/ufiles/files/nakeworobedunazilivim.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fuau6gihfkgd23dlg8a9cvgsvg/24570136006.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/rovovanozopimotudako.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/91024089865.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/91643752782.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/40213318614.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1040a541---mujixe.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/69543010393.pdfPDF link annotation
    • http://kepco-group.com/uploaded_files/userfiles/files/38225676918.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/3850416030.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/21098405693.pdfIn PDF document text
    • http://attlas.center/userfiles/file/21158901561.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/peloxixedikumusufobixaweg.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/vawarifotamir.pdfIn PDF document text
    • http://whatdwellswithin.com/file/36850195363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=owa+sign+in+office+365PDF 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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 16652 bytes
SHA-256: 30094b720be7aec379bd3faeeab2f3005585354b59c387a4da6ebe61bf35998f
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 10852 bytes
SHA-256: d5ded5d2eb3efc42aec8c063daca73dd59f996f64017f5c1f9551dd2bfbea513