Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43f9ed468eff072…

MALICIOUS

PDF

68.3 KB Created: 2021-03-21 11:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9c659118c6768880583f653c432f588d SHA-1: d6f0dbc18756eda11dedd6e8e1c63fd3e042f958 SHA-256: c43f9ed468eff072d06a7eee13e35d4cf15329534557ca1f6cae4234717da773
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with malicious activity ('botokaw.ru'). The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of many links suggests a link farm used to obscure the final malicious destination or to distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://botokaw.ru/award?keyword=benim+hocam+%25C3%25B6abt+matematik+ders+notlar%25C4%25B1+pdf PDF link annotation
    • http://seviregigaguz.22web.org/travel_rock_ficha_medica_2020.pdfIn PDF document text
    • http://javofekuniti.22web.org/toyota_yaris_2020_owners_manual.pdfIn PDF document text
    • http://xusolupofedowi.iblogger.org/cutting_edge_elementary_audio_cd_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/9374412072.pdfIn PDF document text
    • http://zonuzaxesinok.rf.gd/fotav.pdfIn PDF document text
    • http://koxowasone.epizy.com/71527244327.pdfIn PDF document text
    • http://dijovoxokad.rf.gd/47103205072.pdfIn PDF document text
    • http://lufogadiza.rf.gd/degegorefin.pdfIn PDF document text
    • http://puwagof.rf.gd/transunion_cibil_report.pdfIn PDF document text
    • http://taxowojo.epizy.com/25119965891.pdfIn PDF document text
    • http://govativa.rf.gd/rakokunafo.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/laboratory_safety_manual_uc_davis.pdfIn PDF document text
    • http://logiwabu.epizy.com/44908102944.pdfIn PDF document text
    • http://taludoxatimepup.rf.gd/advanced_calculus_and_numerical_methods_notes.pdfIn PDF document text
    • http://gavojomizam.epizy.com/aeroplane_jattan_de_song_djjohal.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/rental_form_in_spanish.pdfIn PDF document text
    • http://litutowi.epizy.com/worksheet_for_grade_3_english_comprehension.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/85087557212.pdfIn PDF document text
    • http://zoxofitelovub.rf.gd/cancionero_catolico_con_acordes.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/petsafe_in-ground_fence_wire_break_locator.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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 5820 bytes
SHA-256: 29aac3531b47723656c8ab3340d0d66b4c182d96d130aeff1659a30c06b2f36d
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 11776 bytes
SHA-256: 183631ed981bae80fcb5bf11581f99b9f119e20f5ecbdadf55fa5be56eb621d0

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