Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad952f574146914a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-15 20:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39d8d5160eda88371f8724ae3b1aaed4 SHA-1: 1c9252fa65c48e742624f0fde1326dff0d88c283 SHA-256: ad952f574146914a8601710984db87d3183ab6072916e954601d208c4c2bb08a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are embedded within the document body and point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the PDF is used to redirect users to potentially malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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=the+runaway+jury+pdf PDF link annotation
    • http://bestapp4u.com/admin/uploadedfiles/file/31401667411.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/13226564114.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xabuzapejo.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/fopoxefudajugazef.pdfIn PDF document text
    • http://web5gstore.com/Files/files/wosirofaputogibupizidaxej.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8864291b---15893330766.pdfIn PDF document text
    • http://w-mill.jp/images/file/bawimojapilul.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/rufadunuwusedelorad.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91521824887.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/fuluvirirafufere.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/61239910697.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/sujadijoza.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/19911722786.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/85387724587.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/99963215745.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/60748720380.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/95409006366.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/wulevefigomumotafulikizu.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/mozipakilulo.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/podomup.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/40131424744.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/limunevidodegino.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/xejudukalotobiwi.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/85923788358.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_off0000bc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0F 10464 bytes
SHA-256: 85ba6ad37d550c22509d15618f593fa2ccfa6dff805467a5cfe95f6b0e21a97e
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 15096 bytes
SHA-256: 8aa79f62cd59900dc54678658cedaa71a87a8031c33a5cb560dedf6f1e42c3de
font_02_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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