Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8883b6df983c2f8…

MALICIOUS

PDF

137.9 KB Created: 2021-03-04 04:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8df71e216c739a27e2028dd454c2dbb9 SHA-1: b724f7e2d1ce8f1b136d0b2015fc382be9c658ba SHA-256: e8883b6df983c2f8c73407e65b2ba0683f6239c77e9423e02b433eebe10b3e91
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=what+is+rush+delta+sigma+theta PDF link annotation
    • http://wijofotezopadik.medianewsonline.com/zarewamipe.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/cuento_para_siempre_camino_garcia0ebjx.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/xanathars_guide_to_everything_spells_wizard.pdfIn PDF document text
    • http://itclick.pro/canon_powershot_elph_170_is_caracteristicaswlcju.pdfIn PDF document text
    • http://sandwichhq.club/polaris_280_parts_diagramtj34m.pdfIn PDF document text
    • http://prizinsta.online/flylady_control_journal_step_1qn5dr.pdfIn PDF document text
    • http://abzac.me/how_long_does_landlord_have_to_do_final_inspectionq9la0.pdfIn PDF document text
    • http://sellforce.ru/aashto_20183jdwt.pdfIn PDF document text
    • http://gafaneripebenu.iblogger.org/dirt_bike_tires_near_me.pdfIn PDF document text
    • http://erogan24.website/sylvia_plath_daddy_imageryaauca.pdfIn PDF document text
    • http://tohld.in/vsphere_client_5._5ka3jc.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/65357754913.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/domain_and_range_mapping_diagram_worksheet_answers.pdfIn PDF document text
    • http://vanlit.ru/87854174526clecj.pdfIn PDF document text
    • http://amsidgi.xyz/23200462345qmkz3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofopeba.rf.gd/aptoide_apk_for_pc_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/excel_vba_cell_value_sheet_name.pdfIn PDF document text
    • http://batefagut.epizy.com/categorical_thinking.pdfIn PDF document text
    • http://gubadif.myartsonline.com/how_to_make_a_negative_person_happy.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/kuzifegiruru.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/libro_el_color_de_mis_palabras.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/53072383153.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E06F 5252 bytes
SHA-256: 254d3442c409480829a0fe2581be01c4ec79f4e823f250b9bb533974c22c6ad9
font_01_sfnt_off0001f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F22F 11616 bytes
SHA-256: 0c21c0172d7d5bfc6f7a09c7dd9aa4bcb98a059fe7691f8fc6fcbcd2c23e1f6a

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