Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca231610d623ba45…

MALICIOUS

PDF

87.4 KB Created: 2021-03-24 14:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f0cfa1b954596444318d2fd62fc227c1 SHA-1: 07c3f5d3fe3d1a4e0221f6d8db90c7984b485b45 SHA-256: ca231610d623ba45633dd3c6dc55ec527330fc4f0c447b1ca6f36e9bc19ac7b6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'deviance and crime in sociology', likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+deviance+and+crime+in+sociology In PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/biweju-rovan-xozana-xozumufotabuja.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/b257c.pdfIn PDF document text
    • https://xewoxexe.weebly.com/uploads/1/3/4/3/134398473/8468254.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/which_is_the_most_commonly_used_programming_language_for_artificial_intelligence.pdfIn PDF document text
    • http://dolanuja.iblogger.org/2018_telugu_calendar_free.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/74885301371.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/geomorphometry_concepts_software_applications.pdfIn PDF document text
    • http://badgesverified.com/pafig1j4nc.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/official_email_writing_tips.pdfIn PDF document text
    • http://p-kavkaza.ru/8865084408htm5x.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/kikitedujoxumojigokariw.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/pool_exercises_for_lower_back_pain.pdfIn PDF document text
    • http://seomagnat1.online/jungle_monkey_run_game_download_apkpurevouev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/how_to_stop_climate_change_at_school.pdfIn PDF document text
    • http://zifenefumob.rf.gd/the_big_short_2015_movie_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/istqb_advanced_test_manager_exam_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/criminal_law_attorney_free_consultation.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/tuzisiwiwojuwabezasu.pdfIn PDF document text
    • http://rafubapon.epizy.com/exercices_etre_et_avoir_au_prsent__imprimer.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/el_conde_lucanor_cuento_51_resumen.pdfIn PDF document text
    • http://texatopewewew.epizy.com/likasem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 5316 bytes
SHA-256: b0b7da83500f947cadf3691c0264baca1d10661f24b6a382add6d4bb6ffac711
font_01_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 11132 bytes
SHA-256: 1ea278b2734a2d1f3de6d6a1dca1073f958423592e589a12bc0388b4a0998099
font_02_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333