Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af7a87c74bca3bb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-28 07:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1e9e3d5b6937fc01b53846f65cab2abd SHA-1: 0ce48f04bf53bb3d6ce7c5f4235975dd690e72da SHA-256: 9af7a87c74bca3bb56054214c9e7955eebef87700372c5575484ae88b28df469
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic findings point to the PDF acting as a link farm and potentially a lure for downloading further content, as suggested by the 'SE_DOWNLOAD_BUTTON' finding and the presence of numerous external URIs. The document body, though heavily obfuscated, contains text related to downloading illustrations, aligning with a phishing or malware distribution pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=monster+hunter+illustrations+3+pdf+download PDF link annotation
    • http://usecabinets.xyz/how_to_fix_rca_remotes7ell.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/xamekadafujivuxaxe.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/jupatejavemusogogumo.pdfIn PDF document text
    • http://gratoram.site/first_aid_certification_expirationkukgm.pdfIn PDF document text
    • http://gisejol.iblogger.org/the_secret_book_review.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/is_there_going_to_be_a_season_2_of_tales_from_the_loop.pdfIn PDF document text
    • http://podipotekoi.ru/man_of_the_house_gamegqa52.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/islamic_ramadan_calendar_2020.pdfIn PDF document text
    • http://relax35.ru/google_account_sign_in_apk5ss06.pdfIn PDF document text
    • http://varietystore.website/formato_de_reporte_diario_de_actividades_en_excel94zzv.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/beta_adrenergic_receptors.pdfIn PDF document text
    • http://piwusipiraxal.22web.org/homelite_lr5500_generator_service_manual.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/how_to_replace_a_belt_on_a_hoover_windtunnel_vacuum_cleaner.pdfIn PDF document text
    • http://vedevejunogi.iblogger.org/samsung_front_load_washer_parts_breakdown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_ff1b8932b10a425b8b6b90da0f895171.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_57ae87628d814b45bc8333891b47a4de.pdf?index=trueIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/baudrillard_simulacre_et_simulation.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/86602787904.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_9c6a38a7aeb14c2ba85f6c1892e4b83a.pdf?index=trueIn PDF document text
    • http://sitafefisoju.atwebpages.com/fet_amplifier_theory.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/clinical_anatomy_of_the_spine_spinal_cord_and_ans.pdfIn PDF document text
    • http://dakawarinuku.epizy.com/nanovunapuxaxovubibasuzep.pdfIn PDF document text
    • http://mexawuzemogo.epizy.com/64054733251.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/jolejudutepumixez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5392 bytes
SHA-256: b8b50c9b770c2423389ca666a16c92771ecf06b83d02e0a7865818d15559f8a9
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 10492 bytes
SHA-256: 8d06a7cb50bd8afd03f417abb42225fa56b7b2dc6021b7dd8406fa59ab9918ec
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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