Malicious PDF — malware analysis report

Static analysis result for SHA-256 1530a4fa07f943eb…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 01:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 179a19d65d963f0c738e931f2020ff12 SHA-1: cef1fb3dec80eff17bae1e385283376856b57710 SHA-256: 1530a4fa07f943eb3ab514564b91544ffacb67bc4fee0f950ec9c607dfdbe44c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution lure.

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://jottigo.ru/123?utm_term=meeting+attendance+sheet+format+in+excel PDF link annotation
    • http://domen3.club/57828520838bygm.pdfIn PDF document text
    • https://xukifunizagopo.weebly.com/uploads/1/3/4/0/134013279/weralotoda.pdfIn PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/6dc3b20aec06.pdfIn PDF document text
    • http://lezepubaj.iblogger.org/real_madrid_clean_sheets_this_season.pdfIn PDF document text
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/6397836.pdfIn PDF document text
    • http://ostanni.fun/63267697835pxt4u.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/turuw-leniguxana.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/sowijumazebu.pdfIn PDF document text
    • http://netzamka.ru/sidiponagopuja32d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nikavavufuxirel.epizy.com/eliciting_sounds_techniques_and_strategies_for_clinicians.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/4615687661.pdfIn PDF document text
    • http://mewarur.rf.gd/vans_authentic_platform_trainers.pdfIn PDF document text
    • http://banobozibijur.epizy.com/paxaxexawapenej.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/dynamics_365_for_finance_and_operations_development_cookbook_free.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/kendo_spreadsheet_events_example.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/clothes_worksheet_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/vcf_file_format_genomics.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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 5508 bytes
SHA-256: e731618569b0c816424d1253baf7c3cb7935eba233c2fa86b4fae60b4a0684da
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10500 bytes
SHA-256: 6eef778787cb53695b8cbd54d79a680190c6e245ef20c02f4c1c2d3d37155100

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