Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f21d6b1b6c5675…

MALICIOUS

PDF

66.6 KB Created: 2021-02-23 02:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8282c3bcc6659361070e06acc9aed538 SHA-1: 68a99e8161470d11da61d4a7e4b875d9d79a8f72 SHA-256: 66f21d6b1b6c56752e94e3c97f8bc4313d22ca9e274ebdedca82dbafc1c2fe5b
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a software download, indicating a lure to trick users into downloading potentially malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution 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://seumenha.ru/123?utm_term=wouxun+kg-uvd1p+software+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381318/normal_5fe0e427d499c.pdfIn PDF document text
    • http://alsamcctv.com/uefa_top_scorer_2019_to_2020i09nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_603211c1939fe.pdfIn PDF document text
    • http://belkwigs.com/parent_functions_worksheet_all_things_algebrannxyq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_602c03ac1c09d.pdfIn PDF document text
    • http://mujizitodosi.22web.org/kajefexojizipaduriwab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393631/normal_6000a70c2c943.pdfIn PDF document text
    • http://everydays.space/36381645332csao7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_5fee354253032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5ffb6d37cec35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_600363eb9afe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fd5fac41b6e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_603439110efde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5ff5f8d674edc.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/fejatepudopito/diagnosis_of_diabetes_canadian_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/fusolevenunaji.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/zimepedabodilu.pdfIn PDF document text
    • http://dazoxamawix.rf.gd/focus_pdca_template.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_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 5592 bytes
SHA-256: dfe75fa4f21ed84db6a7da7ba265621d4817416b2404d12c0cac552ed149ca1a
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10656 bytes
SHA-256: d246d08787740406af6b711b0e8100ca6ec05bcdd86f0ffd2f5a4aa7668ecd53

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