Malicious PDF — malware analysis report

Static analysis result for SHA-256 56732213017cd157…

MALICIOUS

PDF

74.3 KB Created: 2021-04-02 14:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ace7279b2f9658fa9680cdc0adb1e5ef SHA-1: 1eb69fcdc7fd2951ee35911c545c7d1cd6b1cb17 SHA-256: 56732213017cd157426e0a43b4c94ceb194d7b63358376634990f3310caafcfd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=palliative+care+guidelines+uk+nhs PDF link annotation
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/fomiwe.pdfIn PDF document text
    • http://gozimudowojuzun.mypressonline.com/packed_bed_adsorption_column_design.pdfIn PDF document text
    • http://dosijaruwiteli.mywebcommunity.org/risk_board_game_manual.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/sunijib.pdfIn PDF document text
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/5780426.pdfIn PDF document text
    • http://fewudutizoxom.medianewsonline.com/famabazudapi.pdfIn PDF document text
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/6406610.pdfIn PDF document text
    • https://pozuxona.weebly.com/uploads/1/3/1/3/131398461/c77d507f.pdfIn PDF document text
    • https://sanejivuzagegu.weebly.com/uploads/1/3/2/7/132740711/8814675.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/does_seagate_goflex_work_with_windows_10.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/980584.pdfIn PDF document text
    • https://wopinifem.weebly.com/uploads/1/3/4/8/134884590/zawisal.pdfIn PDF document text
    • https://wubugijesagaro.weebly.com/uploads/1/3/1/4/131437106/vulugosuxiwiwe.pdfIn PDF document text
    • http://vuvabadiredowa.getenjoyment.net/kefewilamakob.pdfIn PDF document text
    • https://xiwitewikilimav.weebly.com/uploads/1/3/4/3/134371529/xoduzu.pdfIn PDF document text
    • http://buxuzexutotuf.22web.org/how_to_read_a_scale_ruler.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/2013_subaru_impreza_limited_vs_premium.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/angular_8_reactive_forms_set_value.pdfIn PDF document text
    • http://ribebipewafiwas.epizy.com/bahubali_1_full_movie_telugu.pdfIn PDF document text
    • http://nasakitubaribud.rf.gd/campos_de_accin_de_la_psicologa_organizacional.pdfIn PDF document text
    • http://vomitad.epizy.com/ledodosalota.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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 5328 bytes
SHA-256: 18f9ad37769f8141ada2a56926c7afa86633e4c77858eff6ca361b34fb5c2a5a
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 10100 bytes
SHA-256: 502b4ff9a033efa5f2cdcc9bae19078de6df27850b057710373b59e4befb5dcc

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