Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a778f4f352927…

MALICIOUS

PDF

82.4 KB Created: 2021-04-02 11:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3981bc3a0433476764436695b9990f2 SHA-1: 1e95502db58af65b99b98d547f23883af0ec0984 SHA-256: db4a778f4f3529273c079066d534de9d492df0f5d808b5a9f4cae1880e2f1037
196 Risk Score

Malware Insights

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

The PDF contains a URL that is presented as a download for cracked software, which is a common lure for phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic. ClamAV detection and ML classification further support the malicious nature of this PDF, likely acting as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mezovuduw.ru/wix?keyword=download+idm+full+crack+tanpa+registrasi
    • https://cdn-cms.f-static.net/uploads/4375070/normal_6027a6d6419f8.pdf
    • https://cdn-cms.f-static.net/uploads/4401714/normal_6049a5c1bed4c.pdf
    • http://heretythere.site/22090321690x5gvo.pdf
    • http://reduslim-europa.site/juegos_para_aprender_ingles_gratis_para_nios_4_aos7zvpq.pdf
    • http://rusedewafizurap.66ghz.com/how_to_write_your_philosophy_of_education.pdf
    • http://tertov.xyz/which_book_is_best_for_gate_civil_engineeringnge0s.pdf
    • https://cdn-cms.f-static.net/uploads/4477139/normal_604afb39b19de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://danogilanimerer.epizy.com/norme_arinc_429.pdf
    • https://uploads.strikinglycdn.com/files/cf650c4e-c7c7-4df4-ab5f-a0aa9077330e/wexerukuwubu.pdf
    • http://titegerekarirov.rf.gd/kudebenuxodufed.pdf
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_fd9d393342b849be869d046943ccd8fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fce0b76f-04de-4e99-8b51-f3b2673c20ab/formula_for_finding_interior_angle_of_a_regular_polygon.pdf
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_154c4da7299e49c891da783f539132f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/adbbf497-e624-4860-8f43-4af565bcd2b0/why_do_i_have_sound_but_no_picture_on_my_vizio_tv.pdf
    • https://uploads.strikinglycdn.com/files/a5e2bbd5-2ef8-4c7f-bd9e-6927964dd4c4/cost_accounting_chapter_5_solutions_de_leon.pdf
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_4d2fee0cd4a74f54a66e170e649f7c65.pdf?index=true
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_b4e347ffab7a4dbdb9e4116b80c96562.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab6f899f-2f50-49e2-9272-5519d8cf60cc/59727617752.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef11.bin
cd6492337bf35ccbd9bb4d5e76cfebca20a6ac62f5ef52ee3244956c5f5871df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 5632 bytes
font_01_sfnt_off00010239.bin
4ba5e401aa5a749f4bcb1fcee9c0bb909a6d1a6d2cb3206880ade1e508d2fd25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 7272 bytes
font_02_sfnt_off000115fd.bin
e331d57489f0539aa8d5b1f43b36be6dbcce6e45cd71c3adcb1fa83877e431ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 10676 bytes

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