Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfdc4811cc37990…

MALICIOUS

PDF

82.2 KB Created: 2021-06-12 09:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1178d9e13e515f019fded4a338db7768 SHA-1: c3dc6e9d6f2d966d16c04c7a05837df98eecb388 SHA-256: 3cfdc4811cc379903cceb8f20585e6d5c64a9ad96e5ed3860b061cd689998c4b
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded URL pointing to 'allytemp.ru', which is likely used to download a secondary payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it might be a wrapper for malicious content.

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://allytemp.ru/pbw?utm_term=idle+miner+level+max
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a9b97c8d-b63c-4e00-89b9-3b06271a90ce/97408270165.pdf
    • http://nagomax.pbworks.com/w/file/fetch/144421653/verbs_followed_by_ing_form_or_infinitive_exercise.pdf
    • http://vowujepojez.pbworks.com/f/7910108149.pdf
    • http://bupataved.pbworks.com/f/blocklauncher_pro_minecraft_pe_0.pdf
    • http://zizovitunex.pbworks.com/f/smash_7.0_tier_list.pdf
    • http://popuwepux.pbworks.com/f/95732595058.pdf
    • http://negipidini.pbworks.com/w/file/fetch/145023879/mw_ttk_chart.pdf
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144562017/what_happens_in_chapter_4_of_number_the_stars.pdf
    • http://luwivaj.pbworks.com/w/file/fetch/144802512/pdf_xchange_editor_pro_5.5_serial_key_free.pdf
    • http://nipekari.pbworks.com/f/49909834369.pdf
    • http://midevodimu.pbworks.com/w/file/fetch/144709530/can_you_cook_cube_steak_on_a_george_foreman_grill.pdf
    • http://tereburokofe.pbworks.com/f/download_video_bacaan_al_quran_30_juzuk_mp3.pdf
    • https://uploads.strikinglycdn.com/files/0244dd24-ca71-4cf3-b4bf-183aca000806/80413218269.pdf
    • http://guronavageba.pbworks.com/w/file/fetch/144487761/fortinet_firewall_ios_for_gns3.pdf
    • https://uploads.strikinglycdn.com/files/5a9611df-ecec-405e-b30f-e127e40348d6/rowanu.pdf
    • http://kabutizagix.pbworks.com/f/gta_v_apk_download_for_android_no_human_verification.pdf
    • https://uploads.strikinglycdn.com/files/da11d0b7-90cb-4120-aed1-c3fceb497fb2/pronoun_practice_6th_grade.pdf
    • http://wimarolos.pbworks.com/w/file/fetch/144745365/99620721420.pdf
    • https://uploads.strikinglycdn.com/files/9ec2b2b8-fb43-44fc-87a9-2169db33397b/harry_potter_patronus_quiz_pottermore_buzzfeed.pdf
    • https://uploads.strikinglycdn.com/files/99490437-d734-43bb-a9a3-02aa76aa75c5/tipos_de_organizadores_graficos_creativos.pdf
    • https://uploads.strikinglycdn.com/files/9b2253a7-12ed-463a-a1a6-14ac7ae61030/manudusunalir.pdf
    • http://xuwedateredu.pbworks.com/f/you_dont_know_javascript_get_started.pdf
    • https://uploads.strikinglycdn.com/files/d92c6385-d325-4b72-9102-76f074607a9b/wejilogefe.pdf
    • http://nusometa.pbworks.com/f/75049956529.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_off000100b0.bin
55fd280cbcda935895af4628befbbdb3246dddef4acdd228f073d47449fc680f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 4856 bytes
font_01_sfnt_off00011120.bin
62687bfe0d85d81adc899b1df612f57bc92f5352117ad32c8c3866490acdac42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 13196 bytes

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