Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c87fb8369203a0…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 17:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9948d19510ac33542a110760782f421 SHA-1: b3bc9755f4968be687d898cd211255321fe358ff SHA-256: e3c87fb8369203a0bb4e5b6cf151b65584c0e27dac88da5456d7eabbd0fdc75a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URL pointing to 'dafemum.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=rock+band+4+ps4+song+list
    • http://depepuxuri.22web.org/77637949800.pdf
    • http://kawafopi.mygamesonline.org/carbonate_sediments_and_rocks_under_the_microscope.pdf
    • http://pitetivedu.iblogger.org/league_of_legends_runes_guide_ezreal.pdf
    • http://saripituxupagek.sportsontheweb.net/how_to_start_dog_daycare_business.pdf
    • http://tugeredenazej.mywebcommunity.org/tratados_internacionales_de_colombia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tidigudetefumof/anet_a8_plus_power_supply_upgrade.pdf
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_9d9911e17d8d47599823cef8b3db1eea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5b4640d-8a44-4f0d-9e12-45587672f5ad/iso_9001_vs_iatf_16949.pdf
    • https://s3.amazonaws.com/dukexajuj/talasap.pdf
    • https://uploads.strikinglycdn.com/files/b03905c4-c41e-4c4c-a358-8ac171bc61a4/xezidefolurumepe.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_38b49a10dbdc4430862c0b27e79d5266.pdf?index=true
    • http://xefobimulekojuw.epizy.com/69096059045.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_41f4778f024e49b1996496ee657da380.pdf?index=true
    • http://buwanizun.epizy.com/shazam_windows_8.pdf
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_991f2bae970a484aba8fcd3deae41ee5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4df7314c-0d9e-4f59-87de-a6bcf20e9295/how_to_report_levenes_test_of_homogeneity_anova_apa.pdf
    • https://s3.amazonaws.com/dugibabafod/93263799489.pdf
    • https://s3.amazonaws.com/seriposuj/gomuzexemivivezezizim.pdf
    • https://uploads.strikinglycdn.com/files/d727c48e-78b6-4d01-a411-48abfb8f2390/ronebedufaruvinuxe.pdf
    • https://s3.amazonaws.com/kisimujuk/lexuzozilix.pdf
    • https://uploads.strikinglycdn.com/files/ce9c3732-e306-41f7-8318-ea0dc2bcd14a/libro_azul_2021_gratis.pdf
    • http://satosawinesuf.rf.gd/tojegimokilatolo.pdf
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_5b275b4f6e424682b4d155a8b49bd560.pdf?index=true
    • 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_off00010328.bin
0d70dcddcd9041ca73ceba2a0d3f4351442606f5d02e225f5dd6d42c41119c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 5444 bytes
font_01_sfnt_off000115cc.bin
3f8f03a550f5ce3bfa8caf77129810c97c832cf5f55d17bbca1471a8978ad0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 11080 bytes

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