Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced02d91e138a383…

MALICIOUS

PDF

79.5 KB Created: 2021-05-18 17:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ba1a576a44da7c1a2bdf813b6322a32 SHA-1: 2a4b96537f068c2094a8dc255038ef6dcbf71801 SHA-256: ced02d91e138a383a16173174faf20a7cdc2b5e7c005e716fca420db51d06e36
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 pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results. The primary URL, 'https://seumenha.ru/strik?utm_term=the+poverty+of+historicism+pdf+free+download', indicates a lure for users searching for specific PDF content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=the+poverty+of+historicism+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391009/normal_6057bdb40f184.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/preposition_worksheet_grade_1.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/mibukawimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67d8222c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_60293e911145f.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/a8d06aae1.pdfIn PDF document text
    • https://xusumenebob.weebly.com/uploads/1/3/4/4/134478057/fisorilodo-furiw.pdfIn PDF document text
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/9791856.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/fewotewavofivadazis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5fd2ecd9b7c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_6033a818b8a62.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/falujuwejanimu.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/98b08ad0ce004.pdfIn PDF document text
    • https://fekanefitogi.weebly.com/uploads/1/3/4/3/134340372/4558967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tilixufevoj.epizy.com/86612596878.pdfIn PDF document text
    • http://zomimuju.rf.gd/loctite_22231_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56e4842-3f24-4c83-91cf-15e5f65b99a6/resumen_completo_de_la_gallina_degollada_y_sus_caractersticas.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/small_hands_keaton_henson_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/notes_from_a_native_daughter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4f7379-28fa-47b8-b9d1-09955a50b544/52931136958.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/movies_2018_new_tamil.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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 5596 bytes
SHA-256: f2fd2f902f022481f51d6c2f3665cd4f18d4aa2803ef5fa8af3683bfbef5e6d1
font_01_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 10612 bytes
SHA-256: cea6f0b72b4a121d67d83aa7b2533fd2d9bd6dc5cf4ab14bb4c49726cf11cf4e