Malicious PDF — malware analysis report

Static analysis result for SHA-256 38191a60a065ec4f…

MALICIOUS

PDF

87.1 KB Created: 2021-03-17 16:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cc411c10525cf00cadc45719e27d740 SHA-1: b4450bedfea651dba83c16b70784c982a1513c17 SHA-256: 38191a60a065ec4f799ffed3c9845a4543a42463b92d2a25435a2317facae98d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'nipisod.ru', which is likely a malicious domain used to host or redirect to a payload. The document body, though heavily obfuscated, suggests a lure related to educational content, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=area+and+perimeter+of+a+triangle+worksheet
    • https://cdn-cms.f-static.net/uploads/4454977/normal_603983b29c8fd.pdf
    • http://aires.fun/csi_exponential_functions_and_logarithms_answers1aqcz.pdf
    • https://cdn-cms.f-static.net/uploads/4455876/normal_5fe7fcc550a17.pdf
    • https://cdn-cms.f-static.net/uploads/4418167/normal_604fc6b613dc6.pdf
    • http://copyrightmediahelp.com/oral-b_pro_5000_smartseries_electric_toothbrush71we7.pdf
    • https://cdn-cms.f-static.net/uploads/4404745/normal_604edd81b800e.pdf
    • https://cdn-cms.f-static.net/uploads/4445889/normal_60101fe233858.pdf
    • https://cdn-cms.f-static.net/uploads/4415740/normal_60490e3b23744.pdf
    • http://munasimowijuxi.getenjoyment.net/99041607133.pdf
    • http://duxinivodozular.mywebcommunity.org/how_to_update_software_on_kindle_3rd_generation.pdf
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5ff00ed65c07e.pdf
    • http://usblighter24.site/23671935196mlqfu.pdf
    • http://lotukaguw.sportsontheweb.net/raneg.pdf
    • http://makululi.iblogger.org/samsung_blu_ray_bd_f5700_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_600f51798efe8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://figedid.rf.gd/present_continuous_exercises_for_elementary_students.pdf
    • https://uploads.strikinglycdn.com/files/5aa03bfa-3a24-4f5d-a0b6-eb9885f36a31/fojowurovuvo.pdf
    • https://uploads.strikinglycdn.com/files/616a6340-0815-4439-8724-18007e2e325a/g_shock_5146.pdf
    • http://sekekubonigav.rf.gd/21330768324.pdf
    • https://uploads.strikinglycdn.com/files/65a8f198-7c45-4fe7-8c02-2d58e4899194/zexogevupalenezanir.pdf
    • https://uploads.strikinglycdn.com/files/bf735847-8d07-4b27-9e15-f5f0708e007d/24659298320.pdf
    • http://wajobodiposad.epizy.com/contabilidad_de_costos_un_enfoque_gerencial_horngren_descargar.pdf
    • http://nonetol.rf.gd/betalactamicos_farmacocinetica.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://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_off0000fd78.bin
1a24c0f5e301e8264095f2d5a33bc9c6d7f4fe7ec5630f4967e18cb3caa4fa2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 5600 bytes
font_01_sfnt_off0001106f.bin
17a145b41a413408bb7d592ca1d3df8ba63c4569c0f72c5e0cc45f516ca7aa6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 11520 bytes
font_02_sfnt_off00013820.bin
93aaf966ed8455147f1a2306048d48e328ffcccf8cc59a547b27c0d6742ed831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 16376 bytes

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