Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f65f5c4e4278e14…

MALICIOUS

PDF

79.3 KB Created: 2021-04-01 07:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeb139c40ddc94bad44a152d258e4acd SHA-1: d58bac618544af1de5329d3f813075af85c9d697 SHA-256: 3f65f5c4e4278e147a68cc46d53481a6c900e95289f8a40d2b677c4cd4b58815
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains multiple external URIs, with a prominent one being 'https://seumenha.ru/strik?utm_term=tomtom+n14644+update', suggesting a lure related to a software update. The PDF also exhibits characteristics of a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=tomtom+n14644+update
    • http://manamuposa.getenjoyment.net/cyrano_de_bergerac_film_2020_cast.pdf
    • http://zuxenegobepejij.22web.org/accident_incident_form_doc.pdf
    • https://cdn-cms.f-static.net/uploads/4401723/normal_6016a63e86846.pdf
    • https://cdn.sqhk.co/zururodi/ieTjcid/smart_financial_goals_acronym.pdf
    • https://cdn-cms.f-static.net/uploads/4459636/normal_605478fd56647.pdf
    • http://debovuruzabine.22web.org/genetica_libro.pdf
    • https://cdn.sqhk.co/wememiguw/3haQjbe/nagewip.pdf
    • https://cdn-cms.f-static.net/uploads/4406782/normal_604611422ca2c.pdf
    • http://jaraxusej.iblogger.org/homolytic_fission_definition_chemguide.pdf
    • http://kavevisukedawox.22web.org/amplificadores_de_potencia_clase_ab_ejercicios.pdf
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ffddb33a2032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pabudixobo.epizy.com/nuwurugetesekasixidamu.pdf
    • http://vulebodifoguvar.epizy.com/noteburner_spotify_music_converter_crack.pdf
    • https://uploads.strikinglycdn.com/files/9cf1c269-6ebf-49fd-aa5c-76599f2ad32d/why_do_i_feel_so_hurt.pdf
    • http://fejusadifidexi.epizy.com/alphabet_letter_template_uk.pdf
    • http://leduvusiluvev.rf.gd/besaparos.pdf
    • http://lurolubudoruk.onlinewebshop.net/fetifazo.pdf
    • https://uploads.strikinglycdn.com/files/d1881f76-2a92-44a0-94fa-521f4613f505/brandon_burlsworth_movie_greater.pdf
    • http://jufipixadum.epizy.com/terapia_poznawczo_behawioralna_wiczenia.pdf
    • http://nimanexobubibub.onlinewebshop.net/canada_immigration_form_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea96.bin
67259f94d152d3f07fe26bdd7a1b6d68e1943d72d916ea683f51c6e3a8a8d16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 4876 bytes
font_01_sfnt_off0000fb12.bin
731b94aad22b6d6b70351abe91bb80b8469dc87e3e4e1e0dd287abaa5337c478		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 11468 bytes
font_02_sfnt_off000121ef.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 4324 bytes

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