Malicious PDF — malware analysis report

Static analysis result for SHA-256 10548afe7c84ba10…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 20:37:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2064922c5726dd1e09236752a50b0e SHA-1: 18f518f44d10c9e25ad7db2f784ba07eb907fa76 SHA-256: 10548afe7c84ba10627bc5f79b510f05ef55cd3016e42d2e2f330609247f36f0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, with the primary malicious URL being https://nipisod.ru/strik. ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and numerous outbound links strongly suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://nipisod.ru/strik?utm_term=how+to+set+alfajr+clock
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/wupofimewapit.pdf
    • http://walabowagem.iblogger.org/73257892134.pdf
    • http://nivavonuzav.22web.org/91576544356.pdf
    • https://benejawu.weebly.com/uploads/1/3/4/1/134131543/titanunonajilig_nezarili_papixaso_wuziwud.pdf
    • https://maritomumotoko.weebly.com/uploads/1/3/4/5/134512683/tefogadupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d5246853-1c55-41ca-a502-3ae5f1b37c1e/easy_blues_guitar_riffs_tabs.pdf
    • http://fodiragotisaka.epizy.com/vizid.pdf
    • http://zexenafejesited.rf.gd/does_windows_10_have_a_built_in_reader.pdf
    • http://gefegasoro.epizy.com/apprendre_l_anglais_professionnel.pdf
    • https://uploads.strikinglycdn.com/files/9a7bfede-2a78-446c-913b-dc46341bd558/gaxoxo.pdf
    • https://uploads.strikinglycdn.com/files/f12173f5-8643-457b-a028-446d8262b468/89871664514.pdf
    • http://biwodonugawodil.rf.gd/sixubefalupidu.pdf
    • https://uploads.strikinglycdn.com/files/c832fac7-e42b-4736-a87e-c24d3e2c8f01/what_is_wilderness_first_aid.pdf
    • http://misosemarimo.rf.gd/xedutux.pdf
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_8f53fbd294ee4de8a78094b29bfbe9de.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f9998a24ee78477da4e5d70ca1db96c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44614a9b-7c70-4a88-803d-8aee776ef643/verbos_en_ingles_presente_pasado_simple_y_participio.pdf
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_f3605deab477469b86d259e2bae63bd9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3daee7cd-001f-4a64-b04e-4d2264b94f31/wumejoxata.pdf
    • http://varaxijolos.rf.gd/math_worksheet_for_1st_grade.pdf
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_e3b2cea7985e4407b28d0416b19afc69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/97999a7a-6d1f-4ed6-bdd0-08f5fe9cf33c/how_to_service_a_dyson_dc25.pdf
    • https://uploads.strikinglycdn.com/files/a425c49c-e4c9-4600-9b5c-8621d19f3211/what_is_the_pixel_size_of_my_monitor.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_off0000e6cc.bin
0032bfcaae53c3e3470e182d717ecd3d88728e6e7745fac15580aee97713ef1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 5068 bytes
font_01_sfnt_off0000f82b.bin
f1087798529232d4e7d1d610538694f77f55cf2331cb254848320968d0ba1c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 10876 bytes

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