Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b43c750a895908…

MALICIOUS

PDF

78.9 KB Created: 2021-05-21 15:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6268c3f8b5f7f9b4ff991802e5eb1c14 SHA-1: 9f5f6b350cf3a7c68366471b6afd9d553b35f9cb SHA-256: 88b43c750a895908083d1151240aa6b6305ffa8635e06e5c477b2cf137b85f41
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'baarspo.ru', which is likely part of the phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=bc+caste+list+of+ap PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381347/normal_604e46243de3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5ff253d452f55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447079/normal_5ff2369b7d124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_601f5b00afbff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa519357-9a48-45bb-b943-9a90154dfa42/54350851672.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/aspartamo_efectos_secundarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd79f271-8f6e-406b-882f-55598ff2a043/spring_boot_interview_questions_and_answers_for_experienced.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/ethical_issues_in_business_a_philosophical_approach_8th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/hp_laserjet_p1006_cartridge_35a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dec7005-a5f6-474b-9cd1-127a8a3a02dc/22821013994.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/98198413469.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/chinese_new_year_icon_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/impulse_control_therapy_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/lifesmart_heater_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/circulatory_system_vocabulary_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c644f10-be21-447b-8e67-be1cb48360d3/sabexokagawezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7536c65b-11da-4d64-b2c8-c068b056b18b/the_princess_bride_epub_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2f5319-f4e2-4535-8953-e1f82c227307/80489179595.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/gelakuzafakalilusir.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/florida_civic_literacy_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/piluxaxinarupuxitilibusix.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/35521937241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/599bf189-9276-4273-b88f-159d19429375/what_is_an_example_of_a_complete_subject.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_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 4964 bytes
SHA-256: bf3e8c32b983f3096c8d56338ac4f1f56dca80ae130adf58dc901a2b0486d018
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10164 bytes
SHA-256: 5911e0b4649f523bf5c7572ae4d124771dfbfa7bf691f2b976d5ab004eae9bc2

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