Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4b2d753b8bc5e5…

MALICIOUS

PDF

72.8 KB Created: 2021-04-03 05:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 718b137107bc1c5805c8da57a8b4fbf0 SHA-1: 912358973a81cf29694b7eab2910cb3b2417f840 SHA-256: 4c4b2d753b8bc5e562a193f1ba5e1bff9f3dbc305ad882dbe3ab86a04379ee35
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=guide+ivern+top
    • http://libopadu.scienceontheweb.net/22154339641.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_6017b47147db1.pdf
    • https://cdn.sqhk.co/nolovojawek/dgfEynp/sijaviluzizuzalufepude.pdf
    • http://gisoboxizaza.mygamesonline.org/78863978449.pdf
    • http://tiboxul.iblogger.org/business_writing_email.pdf
    • https://cdn.sqhk.co/webuzifinuno/ihpKZix/kafijotelikubodag.pdf
    • https://static.s123-cdn-static.com/uploads/4405922/normal_6003ed372e9a9.pdf
    • http://roxaresasupuke.iblogger.org/sodutenenawikeva.pdf
    • https://cdn-cms.f-static.net/uploads/4481418/normal_6017359c3337f.pdf
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/76974ef72de15b6.pdf
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/6589157.pdf
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/a0666321.pdf
    • https://cdn-cms.f-static.net/uploads/4379848/normal_601735c470c16.pdf
    • https://cdn.sqhk.co/pigajifaw/eibge2m/the_weather_channel_iphone_app_delete_location.pdf
    • http://vejuwetuk.mypressonline.com/texujami.pdf
    • http://zawugudumi.getenjoyment.net/painting_kitchen_cabinets_gray.pdf
    • https://cdn.sqhk.co/goxufime/bKexicS/rimebozivumozepikagatuka.pdf
    • https://static.s123-cdn-static.com/uploads/4384296/normal_60078d94c7b32.pdf
    • https://cdn.sqhk.co/dubutemaruxu/cPibhih/31146859376.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kugelilizibuwum/vufeboxelaxatodebudekav.pdf
    • http://sulegezusaz.epizy.com/penusevevixukikizib.pdf
    • https://s3.amazonaws.com/jivagajamav/does_microwave_have_a_reset_button.pdf
    • http://milisepidug.rf.gd/medium_format_film_camera_melbourne.pdf
    • http://tozemuj.rf.gd/gasamer.pdf
    • http://kepewitibafef.myartsonline.com/cuentos_en_ingles_para_jovenes.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e108.bin
a66353038f6671625c8ea8c6a3050e74e69c41807c51f7cbb70260a308f954af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 4624 bytes
font_01_sfnt_off0000f0dc.bin
8d67601a3a86cf91f15b25f2b19f220ac2aecd32e228598baec8230ea9bc030f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10960 bytes

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