Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa1b56883b7d49a…

MALICIOUS

PDF

70.3 KB Created: 2021-02-23 03:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1df820cb94244f50183e772d8511a9b6 SHA-1: c0f7859c2b8668b2df06ef690528adca1932b2c8 SHA-256: 6aa1b56883b7d49af916d3e7870594662d8395954b917bcfaf196db272377755
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains text related to 'zoom' and 'portugues', suggesting a lure for users seeking specific software information.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=como+colocar+o+programa+zoom+em+portugues In PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/20446cb95c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_6010a5e3b5415.pdfIn PDF document text
    • http://biwifizad.iblogger.org/multiplying_and_dividing_monomials_coloring_worksheet_answers.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/7204503.pdfIn PDF document text
    • http://zedukibawubige.22web.org/poter.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/c328f865f7647a8.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/1a5d9.pdfIn PDF document text
    • https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/xotewadoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457320/normal_6015f379730ac.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/gulojurem.pdfIn PDF document text
    • http://tibojisitixuno.22web.org/national_geographic_animal_encyclopedia_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/zonebon/biogas_plant_information_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/peter_thiel_0_to_1.pdfIn PDF document text
    • http://wamilexujiweni.epizy.com/how_to_get_started_building_a_new_home_2017.pdfIn PDF document text
    • http://nevuvomadibavid.epizy.com/breaking_the_habit_ielts_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/bafg_antrag_formblatt_3_ausfllen.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/11450455279.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/multivariate_data_analysis_7th_edition.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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 5208 bytes
SHA-256: d80a210e6b0351b11f1da0414cf6eac0cd31561d2db40b0f9cd7d96ae1d08842
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 13432 bytes
SHA-256: ce21b43757dddd6a82110f09cbf6d77bc1a7a22595f1f3a8ef8bddadf57c8960

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