Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e90fd4859aec1d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 01:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21251a076a032695810219aefeab1b32 SHA-1: 1bc3253fc44126dc1edd66097387c7950f0a4dbf SHA-256: 24e90fd4859aec1d6fd846ab9a5d0f160c219e7a74ba1700973ad65f4a106a73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are structured as link farms pointing to other PDF files. The presence of a high ML score and ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document body, though obfuscated, suggests a lure related to movie downloads, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://rfychina.com/upfiles/files/16314041208962.pdf
    • http://e-district.org/userfiles/file/tugisegalar.pdf
    • http://vmkmsz.hu/userfiles/file/xegobupa.pdf
    • http://shiinamotors.com/js/upload/files/bonupo.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/sijakufudar.pdf
    • http://nj-rshb.com/v15/Upload/file/202193849416546.pdf
    • http://medtravel.pro/images/hand_uploaded/files/dijaluze.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161341beb7d286---nopab.pdf
    • http://novena99.com/uploads/files/202109060211254984.pdf
    • https://ka-base.no/images_content/file/44791094124.pdf
    • http://hospitalityroyal.com/upload_files/file/34456952882.pdf
    • http://yokosohk.com/files/fckfiles/file/89538468476.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c0c8cf1258e88583371f90df0cdfc502/dunojuxuto.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/45392336811.pdf
    • http://gabortech.com/admin/file/napajipugofokexunoxuf.pdf
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/buzejitemepeletarokewobij.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/46504820239.pdf
    • http://swiss-ex.com/images/blog/file/51659556735.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/lexudaxivu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=full+hd+south+indian+movies+download+1080p
    • 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_off0000d0fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 16792 bytes
font_01_sfnt_off0000e915.bin
8d46bd69cd3b23041cf81b965e3aa2d70e4f8ba6140a8cc7f9862476c38e215b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 11168 bytes
font_02_sfnt_off0001030a.bin
367b4918c6ec58d8a2c3fa162febcff11338c4c1988255f96d839ce4ff54eac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 20120 bytes

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