Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf34066a6a6c9eb…

MALICIOUS

PDF

140.1 KB Created: 2021-06-06 15:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1acb373156aae67c61f86c7beccb66b4 SHA-1: 0a27ebd0ed7c38a0868df858a3964bd794949e4b SHA-256: 5cf34066a6a6c9ebef8c26af236332756336d3279c1ca808fa374e75d0b7f77f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'To kill a mockingbird' vocabulary, aiming to trick users into clicking on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://synerhu.ru/pbw?utm_term=to+kill+a+mockingbird+vocabulary+chapter+3-4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381997/normal_60469809bbaab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413712/normal_5fe39445c5dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fc5913c4df01.pdfIn PDF document text
    • https://rubuvewoxuvima.weebly.com/uploads/1/3/4/8/134873715/gofebowasun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_606dfd34b222e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fdc14f766191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_601de1a77917d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_603fe90f85a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_604fa22f27d09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_60001bb9508ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_604cf7653d7d7.pdfIn PDF document text
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/lipozigumakube-mifozikubipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452845/normal_6007a6c6efc57.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/385ae30b-94ee-42e5-83cb-77597bd98b1c/how_to_replace_toner_brother_mfc-l2750dw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f2026a2-bb9b-425e-ac96-a191b5281a10/what_devices_can_logitech_harmony_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f04c528-56d9-4c08-9a21-35d0a66a4297/how_do_you_replace_a_whirlpool_glass_cooktop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88235e2f-718b-44b7-9892-98d048f801ca/after_aqui_empieza_todo_pelicula_completa_en_espaol_latino_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b114b4-2540-40d3-a95a-7a5e3adc5648/what_is_inferential_questions_in_research.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_off0001e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E683 5908 bytes
SHA-256: 8ea3fa207be27b5da6c26cb98021040a77e3fdad2c4e90b0803439e4c5e823a6
font_01_sfnt_off0001fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA8B 11896 bytes
SHA-256: a5f7702ef5a2d2c13e90ef27fb3b3e459945fbbb67873dfe90417986410e0615

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