Malicious PDF — malware analysis report

Static analysis result for SHA-256 17407fb576b71eb0…

MALICIOUS

PDF

73.4 KB Created: 2021-03-14 12:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d1b55b20d8bc2b2cab3300f836d77c50 SHA-1: 022cdaae9f8a3694b16598729b04cfe4dd3dad19 SHA-256: 17407fb576b71eb0ed7b540c316b348473871def3758875f48f105c185a49963
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates malicious intent related to SEO manipulation or driving traffic to malicious sites. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/wix?keyword=fingerseek+009+answers PDF link annotation
    • http://lelonul.iblogger.org/93473362214.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/tratamiento_fisioterapeutico_para_hernia_discal_lumbar.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/bidirectional_visitor_counter_using_arduino_report.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/lijute.pdfIn PDF document text
    • http://gtmedis.com/72408421616eklz5.pdfIn PDF document text
    • http://tomandbxof.site/dufipifotolj0ixz.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/vefexej.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/xedafililinimasiw.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/what_are_the_elements_of_misprision_of_treason.pdfIn PDF document text
    • http://stroymarketmetal.ru/open_mind_beginner_a1ekiaq.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/canon_pixma_mx432_printer_cartridge.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/synonyms_and_antonyms_multiple_choice_questions_with_answers.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/astrological_aromatherapy.pdfIn PDF document text
    • http://sokolov.fun/sokajikiveju7ya7j.pdfIn PDF document text
    • http://zafogititug.22web.org/vapikaj.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/periodic_table_worksheet_middle_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/99677357402.pdfIn PDF document text
    • http://fokerek.epizy.com/create_asset_android_studio.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/paul_bunyan_story_printable.pdfIn PDF document text
    • http://nefigubisi.epizy.com/bosch_800_series_dishwasher_user_guide.pdfIn PDF document text
    • http://sodarag.epizy.com/basal_skull_fracture.pdfIn PDF document text
    • http://kagubosewox.epizy.com/common_core_integrated_math_2_worksheets.pdfIn PDF document text
    • http://dirunor.rf.gd/ansys_mechanical_apdl_for_finite_element_analysis_1st_edition.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_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 5232 bytes
SHA-256: d1a78f8c014efd59345f3216a9fa445b2d42afbb875b99d762da1e0534b204ef
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 11300 bytes
SHA-256: 6be8fe1bb040b5e9e2dd99288d76ebbb2bcbc90941ca5a6fcfeef8356ea54a2c

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