Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c16043457aaebe…

MALICIOUS

PDF

74.5 KB Created: 2021-03-29 01:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f966c348c66aa158580bad7458d3cf14 SHA-1: 4556e136813c14fe4f2d83582b5a942f8c1dbcba SHA-256: e6c16043457aaebe96c583b2bdbb94be7d955a5d9410707a6b57fba903d7cfce
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary malicious URL, 'https://resalured.ru/strik?utm_term=honda+civic+service+center+near+me', is presented in a way that suggests it is a legitimate search result, likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=honda+civic+service+center+near+me PDF link annotation
    • http://xizerunax.scienceontheweb.net/25607729902.pdfIn PDF document text
    • http://wide-mean.top/76442927082erepj.pdfIn PDF document text
    • http://ctuxuu.com/armstrong_air_ultra_v_tech_80_ignitorvn3to.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/calligraphy_alphabet_practice_sheets.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/99460353661.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/aiag_cqi_14.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/selective_distribution.pdfIn PDF document text
    • http://itravelgr.com/575883569627df6m.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/59373611967.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/margaritaville_margarita_machine_accessories.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokozod.myartsonline.com/capital_humano_tesis.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/getulebelofafixivakajug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd70ee1-191d-46d3-87cb-566e23f1f7ae/fogafilafisowovewileru.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/84757836674.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/zexajuwoguk.pdfIn PDF document text
    • http://zibelasavu.atwebpages.com/how_fast_can_a_50cc_scooter_go_km.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3548dbfa-fdcd-413e-a328-b6585b37cb46/g_shock_dw9052-1.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/what_was_the_economic_theory_of_mercantilism.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5072 bytes
SHA-256: b91cc74bb693404452d7d26d9d9e4b41788b0bed4c4fbcaefd37ba5604b90e1a
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 10488 bytes
SHA-256: 937cc9345526112729dcd0f8e4591ae98ad68426bbb8cded84a0db52fc6c5c9d

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