Malicious PDF — malware analysis report

Static analysis result for SHA-256 856980f531e93420…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 08:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 765c8bd62e359f36fad50c54b8875b5c SHA-1: a80112f8f8376a4666a14d5d08db0c14f98fb70d SHA-256: 856980f531e934201846e133adeabed5bc56419b4a82a333599c34ca6cc930c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role as a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://stroyindustry.com/userfiles/file/getaleta.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/68410639738.pdf
    • http://asude.istanbul/ck_images/files/wefamutonujonuretov.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614128dbe55cb---nilugajigusedugir.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/64d9d6fb582863d9bdea07eb6cb3f099/kujolofatakapuzoworuduz.pdf
    • http://varosom.hu/userfiles/files/xetadigo.pdf
    • https://masihpt1.com/contents/files/jifavi.pdf
    • https://ipic.vn/userfiles/file/gilomid.pdf
    • http://saveursetsavoirs.fr/image/file/77002348681.pdf
    • http://myconnect-thailand.com/image/upload/File/bitotefulekewisori.pdf
    • https://kfk-dekoration.dk/images/uploadedimages/file/guwoliru.pdf
    • http://naim.naparts.com/images/fck/file/zezubufilejefaditafukuvas.pdf
    • https://kokomanis.com/contents/files/judewama.pdf
    • http://rfaaa.com/UploadFile/file/20210903181738605.pdf
    • http://romento.com/uploaded_files/userfiles/files/derevopipalafogamop.pdf
    • http://cartopack.be/Images/file/suferuneravebobaza.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/badifuje.pdf
    • https://ciar.vn/uploads/image/files/49804405924.pdf
    • http://omonetach.pl/foto/ilustracje/file/28700821352.pdf
    • https://appchecar.com/ckfinder/userfiles/files/64723075327.pdf
    • http://apsons.eu/files/file/21597808389.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=advantages+of+digital+and+computer+technology+in+everyday+life+essay
    • 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_off0000ae3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 16792 bytes
font_01_sfnt_off0000c64c.bin
535bbd4f4ca5878e7065371664c6eafa49c61693d0706bafce1bb33511796a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 15096 bytes
font_02_sfnt_off0000ec39.bin
a14781db2d5d2e2ff74bf7f6b6f4645c2c2f0ffe9336c0079590962fa8d28d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 11328 bytes

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