Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eb4f0812868766…

MALICIOUS

PDF

74.1 KB Created: 2021-06-12 09:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 084e61ce71e8555e3fe3a5fc5562fa15 SHA-1: 684e9b48b0d470754f60266855242d15b5f53236 SHA-256: 27eb4f0812868766e1eaa9682e6a8e5211d1c67d5e5da5adf9fa293e1abe0736
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content, potentially disguised as software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://chcial.ru/pbw?utm_term=norton+antivirus+mod+apk PDF link annotation
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/fodefexoke_rabanorabexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414175/normal_60057a321fdee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_600f9d96cf04a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6048ac1335c40.pdfIn PDF document text
    • https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/xesinenevopupan.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392647/normal_60b5deb864849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_60b90ce14fccf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimutojopog.pbworks.com/f/encyclopdie_biblique_gratuit.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144619809/41700620473.pdfIn PDF document text
    • http://buvevogixud.pbworks.com/f/purazukezapujukoka.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/f/fukiverilulutofazuloze.pdfIn PDF document text
    • http://tukosifana.pbworks.com/w/file/fetch/145167261/84143831811.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/w/file/fetch/144533010/zolemiza.pdfIn PDF document text
    • http://nalujoxerisi.pbworks.com/w/file/fetch/144672579/how_to_fill_in_an_income_and_expenditure_form.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/145045473/nba_live_hack_mod_apk.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/plants_vs_zombies_books_series.pdfIn PDF document text
    • http://zobifel.pbworks.com/w/file/fetch/144617118/wordly_wise_3000_book_10_lesson_3_answers.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/f/74335277345.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/equifax_credit_report_sample.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/avast_secureline_vpn_activation_code_for_android.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_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 5168 bytes
SHA-256: 8ea8ce3c2c8563b51b04e57161870a48a548da7619746f3a3afecdde286150da
font_01_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 11172 bytes
SHA-256: c9905bf20c7aa12306021d75e298cc926763c59770e01825f8cdf0ac5511ef5f

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