Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d60efb899f6927f…

MALICIOUS

PDF

69.9 KB Created: 2020-12-15 16:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fcc4a1d37119c433511b7629b2ad3320 SHA-1: 912475c5abf8d61d12701c48d667496bde3c58a3 SHA-256: 9d60efb899f6927fbc87aa7d5c612c9a337382a57d6c598b401830cc54329cd4
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, which is also flagged for brand impersonation, specifically targeting Facebook. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting. While no scripts were explicitly extracted, the PDF structure and malicious link suggest it's designed to exploit users through a phishing lure.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://cctraff.ru/123?utm_term=operations+with+rational+numbers+worksheet+8th+grade+pdf.
  • 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://cctraff.ru/123?utm_term=operations+with+rational+numbers+worksheet+8th+grade+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f89bef03fb8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5fc150e2ac545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_5fa34aa85f193.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/tobojelusiwi/best_free_offline_translator_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/android_google_maps_speaking_different_language.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fcf6c305c8977691e3c4eb4/1607429168831/electronic_products_made_in_china.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf504c3485235c86bcf706/1606373452946/59521869769.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc539263398ff75154a2945/t/5fce93377fcaf32d844c5293/1607373624248/learn_to_read_music_for_bass_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/solitary_pulmonary_nodule_fleischner_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/zizuwowavoxuse.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/citation_mla_format_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/pepebepadafejopebijusego.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/54612733271.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 5972 bytes
SHA-256: c12ab56caa502c15ce9aa0dd3839c898fe39bf450c5f186e8e3e1b89b053bb9a
font_01_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 11060 bytes
SHA-256: fa2728a765270fc455034c850c56db25621201fe835371aa4cc31f1e186c6efc

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