Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5a8fa44bd4bb06…

MALICIOUS

PDF

105.7 KB Created: 2021-03-21 21:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: eccf93fb2af5fa6219e53d6d913229be SHA-1: 57489cbe302e47b5daa18d2c105dcf73bbe3abe6 SHA-256: bd5a8fa44bd4bb06ac3e04fc4732a85efd456990ac0084fc86f40b35775e35e9
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, references an audiobook, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=we+are+all+completely+beside+ourselves+audiobook PDF link annotation
    • http://ig-copyrighthelpcenter.com/23722577735fk5c7.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/introduction_to_the_theory_of_aeroelasticity.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/24234132672.pdfIn PDF document text
    • http://mibijuzorifif.getenjoyment.net/70978973769.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_much_does_a_interior_designer_earn_in_south_africa.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/download_film_fifty_shades_of_grey_2019_sub_indo.pdfIn PDF document text
    • http://rmk4sale.xyz/80714854575dgh5i.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/bafg_rckzahlung_freistellungsantrag.pdfIn PDF document text
    • http://totalcreditreport.info/best_way_to_do_road_to_hanadw1pz.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/dolokapuranadisibonoxobaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/xuwepesidibuwibobafuga.pdfIn PDF document text
    • http://lidezitenojugit.epizy.com/which_major_is_better_biology_or_biochemistry.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/bioenergetics_lecture_notes.pdfIn PDF document text
    • http://niwuganol.epizy.com/vba_select_all_cells_in_active_sheet.pdfIn PDF document text
    • http://bofametif.rf.gd/ejercicios_resueltos_de_absorbancia_y_transmitancia.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/naomis_room_book_summary.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/what_is_the_symbol_for_receptacle.pdfIn PDF document text
    • http://jibufunipibavu.rf.gd/athens_georgia_weather_report.pdfIn PDF document text
    • http://pidegesuwi.epizy.com/tatefiledimilik.pdfIn PDF document text
    • http://wopojewatomajam.rf.gd/gapunixutoroseferurake.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/woraledabufogixim.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/assembly_language_step_by_step_linux.pdfIn PDF document text
    • http://safipalibeso.rf.gd/38653867316.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/universal_laser_systems_pls6.150d_price.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_off00015e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E48 5600 bytes
SHA-256: 579b2b12778b33e4ae8eceb4141c60680a6ab90dff6221210407354158109036
font_01_sfnt_off00017148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17148 11660 bytes
SHA-256: 51f101767966025855f151f80b5f23e6fa80670113d54ef2fd07a9e42a2d3966

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