Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85dcb9438a9cd29…

MALICIOUS

PDF

71.7 KB Created: 2021-02-22 07:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7908207699851fcfbf22b15950f14e4b SHA-1: ec5d36dea210e24f38bba0d351be27c4bc8adfb3 SHA-256: a85dcb9438a9cd297a0a2d147f0b9192d2f7ffb2667c2c9472c2c41c561aa56d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that, when visited, appears to be a search result for a technical query. This is a common lure to disguise malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=convert+text+into+date+in+ms+access PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374536/normal_6010e7b7885d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_5ffa3d6d9bdab.pdfIn PDF document text
    • http://samozanyat.info/jovew5fxlo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_60178ad616f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_603033d18a55b.pdfIn PDF document text
    • http://comp-arenda.site/chaudhary_charan_singh_university_online_examination_formubdhv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6014e9855041a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_601de89b67f1e.pdfIn PDF document text
    • http://bigchance.pw/henley_passport_index_2019fc7s2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_600f74027a8af.pdfIn PDF document text
    • http://cabinetsop.xyz/61143322379hm9jw.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/magapeguwabe/free_magazine_template_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/fatigue_management_guidelines_qld.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/803222671.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/child_adoption_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/66093218844.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/fahrenheit_451_part_3_burning_bright_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/tests_for_aldehydes_and_ketones.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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 5084 bytes
SHA-256: 6fa57d564574dd6141846ea6a98275a2108769ca840ccafe28930a0c012eaa30
font_01_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 10736 bytes
SHA-256: 2350f6f8b15c589b92c9c1f868532317bc751f466943226f008a92ef4e71ea76

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