Malicious PDF — malware analysis report

Static analysis result for SHA-256 651a89d63a2ef9f0…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 09:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: feb54f9ef09859cb367bd289db3a5916 SHA-1: 402e833fdabdc25c2058bce96d1051b2eee647a0 SHA-256: 651a89d63a2ef9f0d4349c8d9a0c404a9818b4a180b3efd8336904b3e59738ab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://dugedepap.ru/strik?utm_term=quantum+chemistry+physics+definition, which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=quantum+chemistry+physics+definition PDF link annotation
    • https://cdn.sqhk.co/sotatixorawi/jeiifhh/dokuwata.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/short_passover_haggadah.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/the_sea_of_monsters_summary_shmoop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_606395d1ad10d.pdfIn PDF document text
    • http://immortal-sho.club/josezamufirul41skk.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/mamapaxedijigetitefkixdi.pdfIn PDF document text
    • http://puruzil.iblogger.org/77819248460.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/W4jgyie/enemy_strike_3_para_android.pdfIn PDF document text
    • http://tamakar.tech/student_information_management_system_project_in_phpee22y.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/jtb1Ehh/aitchison_college_lahore_uniform.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393647/normal_5ff76de4b1e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_604a3b96201f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401711/normal_5fdbd9ea3bb8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofijiserige.onlinewebshop.net/nurojoberarixuxuvixuf.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/carestream_drx_revolution_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/melee_barrows_guide_osrs.pdfIn PDF document text
    • http://latodoro.epizy.com/titebond_wood_glue_msds.pdfIn PDF document text
    • http://tukuponuvul.epizy.com/31180794965.pdfIn PDF document text
    • http://dudawugir.epizy.com/ashrae_handbook_fundamentals_1993.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/what_is_inclusive_school_community_relationship.pdfIn PDF document text
    • http://jagijib.epizy.com/49060427758.pdfIn PDF document text
    • http://gipetiwivi.atwebpages.com/87840093993.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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 5528 bytes
SHA-256: ea02fd1d0a8c70b798e7588c94b17816f1c2ecf39fe3e4375d8c1f74dcbf0d00
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 11720 bytes
SHA-256: e8f0892fdbcb5f60ccd575c46ed9e1d7b5b2329df2223b6b2a6ed2e3697c0588

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