Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd53197ecc9557c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 16:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9313bea7b48587087b5deca7384c1f49 SHA-1: a44ff48df6980aff3feaaa9756fb86ab68ea0bcb SHA-256: 7fd53197ecc9557cf988bc50d62d6e38c7deb41cbae12766a65114c91fa4ffe3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many on disposable hosting, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm designed to obscure the true destination, likely a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catamma.ru/uplcv?utm_term=12th+bio+zoology+book+pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kuzamebisezevireluruguti.pdf
    • http://metisentry.net/ckfinder/userfiles/files/wasovotobe.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16148f977dea75---wemosajudasadinumes.pdf
    • http://udmvdpo.ru/images/files/80625099295.pdf
    • https://pacpartner.net/images_client/imagesfile/pofusupigorupam.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cf874e8855baea28d79a15231fd9ee58/75078188.pdf
    • http://packturf.fr/files/kalinubovozoxijilopenijuw.pdf
    • http://fullerton.kopanramen.com/uploads/files/gafatikavigipijaj.pdf
    • https://expomediainc.com/upload/file/rebopo.pdf
    • http://khachsanmyngoc.com/upload/files/kapojitur.pdf
    • http://heimundsicherheit.de/userfiles/file/20550240113.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/25357907037.pdf
    • http://asremajazi.com/uploads/files/mewawuwalakowisef.pdf
    • http://urotunisia.com/uploads/FCK_files/file/kiduzurukelixeziligiref.pdf
    • https://airin.lv/images/userfiles/file/40538408645.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/92666584176.pdf
    • http://brezov-gaj.si/uporabnik/file/71335613304.pdf
    • https://sts-cct.com/app/webroot/userfiles/files/31340634060.pdf
    • https://vili-al.com/uploads/wysiwyg/files/18125458184.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/fiwob.pdf
    • http://ingmontagna.com/userfiles/files/redovixoninivokale.pdf
    • http://stolizstekla.ru/userfiles/file/dipelerag.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_off0000b1b9.bin
8eb208594b1780ede443d1aa7a8e15cba0cf4b2b6b543f9405ef8efb16c132dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 10592 bytes
font_01_sfnt_off0000c9a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 16792 bytes
font_02_sfnt_off0000e1ba.bin
d1fec6d9d22f83e424597490ea149cc2f1a258be52b086c1fe519e7d3e23ea40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16508 bytes

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