Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b30ed6fa2414635…

MALICIOUS

PDF

75.7 KB Created: 2021-03-14 07:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7031ee48878bba423c5b1498d95eefb SHA-1: 9dd4715042b7d9ce71842a34c452caccfdead5b1 SHA-256: 6b30ed6fa24146351b2ddb79622e70c916c494797a2093b8c3507654f63888c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/wix?keyword=ultimate+guitar+premium+free+apk PDF link annotation
    • http://titoto.xyz/ballet_at_home_youtube_workoutscu2y4.pdfIn PDF document text
    • http://yourcy.com/fresnel_biprism_experiment_viva_questionstufm1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_601a392264cda.pdfIn PDF document text
    • http://grantmedica.ru/5624687042hv7p3.pdfIn PDF document text
    • http://capridigi.com/how_to_show_photosynthesiscepmk.pdfIn PDF document text
    • http://titanovyi-filtr.ru/cambridge_md_weather_reporte9asl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369782/normal_5fde60ba12d5d.pdfIn PDF document text
    • http://select-get.top/the_worry_cure_amazon_ukdwsh2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fe66dac15cce.pdfIn PDF document text
    • http://lumacy.site/iit_madras_placement_reportr5e91.pdfIn PDF document text
    • http://blue-tick-central.com/nedutekavijajoz2vf1.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/jalasilunaz/red_chambray_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/allow_button_not_working_android.pdfIn PDF document text
    • http://sonisan.epizy.com/angry_bird_tamil_movie_song.pdfIn PDF document text
    • http://wugadavax.epizy.com/covalent_bonding_worksheet_answers.pdfIn PDF document text
    • http://nudibiwer.epizy.com/padutowuvevupaji.pdfIn PDF document text
    • http://bujubumufeji.rf.gd/5158204655.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/social_values_in_education_definition.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5100 bytes
SHA-256: 74feb8e0ca19999b75f7756da6c1d052113adf0f7003080a17d1b06b9af9e922
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10764 bytes
SHA-256: e7df82375ff1a747bfa061004dd3587ff0f2c0d2f1b18fa8c0d22d1bde031d4e