Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fecc6863e4f707e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 09:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14c4911e24d938d890acecbc186576a5 SHA-1: f0613e1ce1f9d27f3982da18f00da0dffcbb0a91 SHA-256: 8fecc6863e4f707ecea812f676fe615e80d3bcb088222924fc6ab0643bde4924
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the links suggests a phishing attempt via attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://allytemp.ru/uplcv?utm_term=18+korean+curse+word
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/soloxor.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d8ec0eb39---xolasoranolopadususubunuv.pdf
    • https://incense888.com/uploads/files/202109182208515825.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/88548730220.pdf
    • https://aspit.ro/imagini_ws/61645278603.pdf
    • http://bjsddesign.com/filespath/files/20210909191641.pdf
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/29942633585.pdf
    • http://letresorellebio.it/userfiles/files/norirosorutumivudewa.pdf
    • https://gadd-asso.org/userfiles/file/kevaxewupe.pdf
    • https://satybharat.com/ci/userfiles/files/15570351072.pdf
    • https://hrmconsulting.biz/upload/files/sufixuzila.pdf
    • http://mobiliteit.nu/files/livazodawuwefoxexegonefir.pdf
    • http://logopeda-empatia.pl/content/file/75171426284.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sonotodiposebezaluwaj.pdf
    • http://praguetransfer.com/files/file/24077402488.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/19811b10c1faa2dbd8b9e01d4fe4f7fb/kixaliwugufotajak.pdf
    • http://koutingchina.com/upload/files/17539409266.pdf
    • http://telesson.net/_UploadFile/Images/file/jelaxekejovagelakutizu.pdf
    • http://hoanhaochemical.com/uploads/files/460938457.pdf
    • http://progettarecasa.com/userfiles/files/89459129275.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/wumenotilapuzasoxevovofo.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_off0000ebb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 16792 bytes
font_01_sfnt_off000103ca.bin
385e8a46127651cb14ecfb9cbdd3833e11ea44f2663ebe680206e3af07e5c9ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10568 bytes
font_02_sfnt_off00011c19.bin
02ca9600674c059616fd51f0b41b378fe768382a296d89d6664470ea7655bea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 18696 bytes

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