Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d92a8adf94493b…

MALICIOUS

PDF

79.9 KB Created: 2021-03-14 19:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ceadf78daf9b39e2352e1523f30b195 SHA-1: 128341caa4280c7aff4e9d381ea75692ff260703 SHA-256: d5d92a8adf94493b58469333527269c61c209ebd24e498aaa3f7b84635ff364a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded external URIs, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards a phishing or SEO manipulation attack. The primary IOC is the suspicious URL found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-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://jumiwimov.ru/strik?utm_term=dream+dictionary+dog+poop
    • http://kidufamipowanot.mywebcommunity.org/600_essential_words_for_the_toeic_mp3.pdf
    • http://nupewijanetari.medianewsonline.com/medepojag.pdf
    • http://vonokumi.iblogger.org/format_mac_using_bootable_usb.pdf
    • http://vawurabel.mygamesonline.org/sevetunonabiwapakowudowak.pdf
    • http://ligalirulal.22web.org/automobile_mechanics_nk_giri_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xedewofuretujo/data_analysis_in_research_methods.pdf
    • http://giwolexuki.rf.gd/avatar_3d_digital.pdf
    • https://s3.amazonaws.com/jusuberu/centrifugal_pump_design_and_performance.pdf
    • https://s3.amazonaws.com/dudujopixejikug/84578160722.pdf
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_0cdc296c3d424d1e8c6e01cfbb0341a0.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/99992797134.pdf
    • http://wimakis.epizy.com/2365978242.pdf
    • http://pumikowexudat.onlinewebshop.net/92006057201.pdf
    • http://meduzifovum.epizy.com/how_to_use_canon_rebel_t5_as_webcam.pdf
    • http://sajipesexadagon.epizy.com/mejozejabigarusoresok.pdf
    • http://pewesinelukaveb.epizy.com/4380353651.pdf
    • https://s3.amazonaws.com/lixasifasi/fema_ics_100_c_answers_2019.pdf
    • http://forofadikov.rf.gd/notetasoj.pdf
    • http://zaninoj.epizy.com/sejew.pdf
    • https://s3.amazonaws.com/debiwelof/how_many_days_annual_leave_do_nhs_nurses_get.pdf
    • http://suginuzebaluwom.rf.gd/design_procedure_of_centrifugal_pump.pdf
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_ec8d1599138642d4904e8bae29ff4778.pdf?index=true
    • https://s3.amazonaws.com/zinudipir/leketag.pdf
    • https://s3.amazonaws.com/nazekisigiduz/bismillah_ki_barkat_movie.pdf
    • https://s3.amazonaws.com/pasawexawinogad/latin_night_clubs_in_atlanta_georgia.pdf
    • http://jowosos.myartsonline.com/24337228844.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_1926d598809448e99bce29f25ac1ee88.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_off0000fd3b.bin
696c40750bae6abc804b67d5c1e62b2d8591c5b4542170a382476b46e116d420		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 5284 bytes
font_01_sfnt_off00010f30.bin
0cffccbab323955090b6da7af8fda8311bce7c9a6bc5bdab0eed7a7d086881c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 10320 bytes

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