Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e24d5958cadee8…

MALICIOUS

PDF

85.8 KB Created: 2021-03-17 21:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d02d016a647e62a8ac3ba68d43f40e35 SHA-1: d24cc9d64b0f8641ab0c8bc7d8dd6f880fe35356 SHA-256: 18e24d5958cadee8b5ab490347b3f7ec8a01218d8459394a9af0e81da5abdf30
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing infrastructure. The primary malicious URL identified is https://resalured.ru/strik, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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=samsung+65+uhd+4k+smart+tv+nu7100+series+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367632/normal_5ff6608c36198.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/how_to_open_top_of_whirlpool_cabrio_platinum_dryer.pdfIn PDF document text
    • http://sellforce.ru/gowezuxofezenuvuvelenezcgj1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6017637147f09.pdfIn PDF document text
    • http://solokekojo.22web.org/bodolemokepusupebawofud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450638/normal_5ff75588d4ad0.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/the_professor_and_the_madman_storyline.pdfIn PDF document text
    • http://trellos.fun/hp_laserjet_pro_400_m401a_printer_driver_download_for_windows_71cif3.pdfIn PDF document text
    • http://siteznakomstv69.space/digital_marketing_salary_in_canada0jezy.pdfIn PDF document text
    • http://trellos.fun/66813940096ggo3h.pdfIn PDF document text
    • http://mylic.ru/4269542799060vgz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427799/normal_5ff2334c3f611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fc6840eefa05.pdfIn PDF document text
    • http://danatadosona.iblogger.org/crochet_patterns_for_hats_easy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://medazupu.onlinewebshop.net/alfabeto_ruso.pdfIn PDF document text
    • http://lugumew.epizy.com/wogipasuse.pdfIn PDF document text
    • http://rexawisoza.epizy.com/86855248976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03428eb3-8ffd-4cb7-af68-b662029940f7/excel_vba_call_subroutine_in_another_worksheet.pdfIn PDF document text
    • http://fajamoluw.epizy.com/lenatozewutizisasediwa.pdfIn PDF document text
    • http://woxikajir.myartsonline.com/99564092934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab121cd-a42d-4632-8c01-9fcb1cb83f89/integral_of_cot_squared_x.pdfIn PDF document text
    • http://sinalowus.epizy.com/43123290819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df565766-1c2a-4271-aceb-fddf19d02136/how_does_an_american_get_a_job_in_germany.pdfIn PDF document text
    • http://jowosidinaruxu.rf.gd/24626570364.pdfIn PDF document text
    • http://demuremapinob.epizy.com/wodinotu.pdfIn PDF document text
    • http://ginodoto.epizy.com/que_es_composicin_de_la_fotografia.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_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 6072 bytes
SHA-256: 1ba9b37fedc33da16a44b553c8e9f837fd92eed770ce37835328f6151f34b162
font_01_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 11748 bytes
SHA-256: 7a7cf363d5349214092e6c4fd5aa254990f902074df059f0785ae2705e2c6aa4
font_02_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501