Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f50628fe6c11c1…

MALICIOUS

PDF

82.9 KB Created: 2021-05-21 20:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 59cf8942716cbc8c348b7ec6f0e4b18c SHA-1: 26056a9ceed90b684f90cdd4e7775549b6b6e444 SHA-256: f8f50628fe6c11c1905d03730cbb44a99c11967ee76329d79d726e93feaf9785
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://druttle.ru/strik?utm_term=menu+semanal+dieta+cetogenica+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453553/normal_605fb6aa0e0f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_602c388aa984f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_60507b7685d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_60669d83454dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fcdcff7b61eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_6041817521a58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fef8c0a4eb19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_60177f26ca957.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/wizedumi/mitel_5330_ip_phone_auto_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/blank_monthly_calendar_template_june_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/arya_2_movie_songs_free_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/how_to_integrate_cos4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0995a3f-fbe4-41b6-847c-d06a24b7ec59/81848759504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72ce3fe-23bf-48bd-bfbe-b5e44b6494aa/12937239692.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/7._3_dividing_polynomials_by_monomials_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81eefb3-20b6-429e-8d81-d45f4f436525/59668039648.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/nokujelasurowoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc75c39-f6f4-4269-8de8-448596f24e19/16449429449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bf4450-5522-42ec-80a7-1e115cfb8ae5/m-audio_fast_track_pro_macos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4e5ee7-848a-4179-bc6a-d004579be321/bitime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9ac192-20bd-46b9-bdb3-725d835d0dd9/2017_ford_e350_oil_change_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/apologia_de_socrates_platon_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/gugujubatoduwibopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e68c0a-a947-422a-819f-42ca4083ca90/62599617821.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/indo_acidatama_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/sample_paid_time_off_form.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_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 5384 bytes
SHA-256: e3e36510f0e77ac0a707ad9b38bce3c189d104ac1614425243561d02418d1ee2
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 12704 bytes
SHA-256: f6ca56ab6c856637d0eea101619035cce2c88bb2f7ceb9171d8e0e0d48ef1c3d

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