Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a77cc351a656395…

MALICIOUS

PDF

81.5 KB Created: 2021-04-22 21:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0162a7cf0f4db7ed873077f237c3adc3 SHA-1: 5a2a692a2cfb025ff56db7b85f7eba223e2ae480 SHA-256: 4a77cc351a656395a4db7da7cbd46e935bc3bc3f54e422674c53243e6ec414ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document body contains a lure related to a "2500 in 1960 value now" and points to external URLs, one of which is a link farm on disposable hosting. These elements suggest the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

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://resalured.ru/strik?utm_term=2500+in+1960+value+now PDF link annotation
    • https://cdn.sqhk.co/sebixodof/jg3vjhT/1290_super_duke_tank_pad.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/caracteristicas_de_las_neoplasias_benignas_y_malignask0tlf.pdfIn PDF document text
    • http://ketotreno.buzz/why_do_irrational_fears_existuaim8.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/Jo3hegd/kusewoxuxixazidukug.pdfIn PDF document text
    • http://fishland.store/32356487281o9vjm.pdfIn PDF document text
    • https://cdn.sqhk.co/bofotabi/Tjiebib/ethyl_chloroformate_reaction_with_water.pdfIn PDF document text
    • http://milansit.space/is_intelligent_design_falsifiableb4b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/L0jj3tB/desert_survival_shooting_game_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/ckhcOgc/padokura.pdfIn PDF document text
    • http://euroshopmn.space/algebra_lineal_gratis6mtz2.pdfIn PDF document text
    • http://fullstacket.online/global_history_imperialism_in_africa_answers6bzfy.pdfIn PDF document text
    • http://d-youtube.com/metro_2033_redux_walkthrough_dead_citycv98k.pdfIn PDF document text
    • http://bandalet.club/music_notes_treble_clef_worksheetweqlk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewivifonawati.epizy.com/zudefosemosulus.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/70187033595.pdfIn PDF document text
    • http://xowiweruxuz.epizy.com/bucharest_grill_menu.pdfIn PDF document text
    • http://lobobeges.epizy.com/my_school_life_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/jeep_grand_cherokee_pcm_reset.pdfIn PDF document text
    • http://togotavasokuzez.epizy.com/19050203006.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_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5220 bytes
SHA-256: c2bdaf6bfc017ff9ef9cfdea5112f8c1826eb9a7177825eee0b02f81238c89b5
font_01_sfnt_off0000fa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 11532 bytes
SHA-256: 5bc8e6994737d647f691003d5b89283b96f992fc445040a9dd734be974072390
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16256 bytes
SHA-256: f31b57374d30af00df61fdd46edfa35111aec8df019cb1477bc78a679847460f

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