Malicious PDF — malware analysis report

Static analysis result for SHA-256 523128bf5bd5095c…

MALICIOUS

PDF

73.2 KB Created: 2021-04-26 01:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2557cf69fa2daedbfa5c8a1646f9b2e3 SHA-1: f3dbfaa868012d8141cefffb61a2eed93e3877b0 SHA-256: 523128bf5bd5095c9866bc6592ce4a98997c486cdd2a6e1fdd426d11f4230bd8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear textual 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://fokemale.ru/strik?utm_term=what+is+a+chaos+coordinator PDF link annotation
    • http://fakurivevid.scienceontheweb.net/sylvia_plath_daddy_analysis.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/mufirekomaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456667/normal_60031f88c9056.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/ziwirafutusuduwexuxemi.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/xetewumajanawudeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5ff9aa0e183d8.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/disadvantages_of_workforce_diversity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_5fda3e099a68e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446921/normal_5fdd7cd1a5c23.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/99355542258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d51f33-1b3e-47e6-90a6-0835d133deec/70383687527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b9d5f7-417b-4cda-b747-5c772fd0e233/69389751132.pdfIn PDF document text
    • http://sanojepenot.onlinewebshop.net/53936967498.pdfIn PDF document text
    • http://zevusup.atwebpages.com/39439919048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e1c361-cf58-416a-9273-d0ed1b60dfad/how_do_i_fix_my_wine_cooler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951c2106-5e7c-4139-951d-7441dcbbd2f8/liparumapudinawefet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39735b6-9f18-4a96-8b81-89390c843742/69227647177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a5d578-1628-4c6f-8a89-62f095b8b955/clarence_larkin_dispensational_truth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4311a9-6b84-456f-8f27-5c7b4904c952/build_a_rocket_stove_mass_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb67051-a257-4343-a03c-6396cfa19e90/panasonic_viera_tv_wont_turn_on_red_light_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b776878c-6c40-4e29-a3b8-fb780751a701/how_to_program_comcast_remote_to_rca_tv.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/42622732465.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/government_maternity_leave_form.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5008 bytes
SHA-256: 91170bbf6d3e44f9183399717de665f522a05ee99231aa9db134e0f0d09d98ef
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 11252 bytes
SHA-256: cda906b5569dbb4413b28b2bc1542efc91a0dda98f58f2386e430975c82f0650

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