Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30ec6ceec8663f…

MALICIOUS

PDF

74.9 KB Created: 2021-03-04 02:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3f6cbc6e34acaefbabc65aba20d57288 SHA-1: e4e33dedcf6472bf9a53e8fc3a53b4cf478ce72a SHA-256: 8e30ec6ceec8663f1de669809bd705976a29050e9800523c8c2f7b8df5e42135
126 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 it likely contains malicious content. The document body and extracted URLs suggest a phishing attempt, masquerading as a search result for a common technical query to entice users to click on malicious links. The presence of external URIs and a link farm heuristic further supports this, indicating the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/aws?utm_term=how+do+i+connect+my+brother+hl+l2305w+to+wifi PDF link annotation
    • http://vannabanyavsedela.xyz/kifowatazetisakolt4rfs.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/what_does_the_dashboard_symbols_mean.pdfIn PDF document text
    • http://ins.expert/how_do_you_reset_a_luxpro_thermostat_on_a_psp511lca1fgzr.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/badger_insinkerator_15ss_3_4_hp.pdfIn PDF document text
    • http://forexgeeks.net/15410815239rgfbv.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/management_information_systems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_603086ec362f7.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/what_are_the_steps_in_research_methodology.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/venomokejozo.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/elevator_parts_counterweight_guide_shoe3wvpr.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/how_to_reset_password_hp_officejet_pro_8600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/google_slides_swot_template_free.pdfIn PDF document text
    • http://mugevewobota.rf.gd/72868555430.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/how_do_waves_affect_the_shape_of_the_coastline.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/arcade_fire_beach_song_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/supoxedikukaxebarogizo.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/application_essay_format_example.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_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 5732 bytes
SHA-256: df32cd3812f11abad5ab4e6a19e7a88131d13011d2453d4bcb80fd343f613b20
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 11988 bytes
SHA-256: 856ba52ff38652e9a88ee7f8a4cb48b692d6e6c6e2af40bebeffdda232297713

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