Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb19c23f194d4844…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 15:11:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2387d438f32265e2748e12f1ccaa90d7 SHA-1: 22482210b41bdb3fd8edf8cddf13730a3d26e5b7 SHA-256: fb19c23f194d4844a01ea433d609b293ce4b52e699d0cd85a42956ef60d545e4
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The embedded URLs and the PDF's structure indicate it functions as a link farm, directing users to potentially malicious external sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xezojetit.ru/award?keyword=why+is+it+dark+between+my+teeth PDF link annotation
    • https://cdn.sqhk.co/zodozane/a4ZfgjY/zagusose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fcc7a42b2a7a.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/vergil_aeneid_latin_translation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fcc49ac1fdeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498997/normal_6006b14ecdc26.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/36_sub_zero_refrigerator_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/ihhaNii/kokoluzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_60375571144d6.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/jhgcSjf/fewarubusedemadokele.pdfIn PDF document text
    • http://tikutajufa.22web.org/52605075230.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/cjcoA4p/zejob.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/pioneer_avh-x4700bs_not_turning_on.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixobanawogoki.epizy.com/classical_mechanics_goldstein_solution_manual.pdfIn PDF document text
    • http://bitines.myartsonline.com/how_to_reset_error_code_on_rinnai_tankless_water_heater.pdfIn PDF document text
    • http://womawujun.atwebpages.com/deadpool_comic_book_series.pdfIn PDF document text
    • http://dofumexuvit.epizy.com/bilingualism_journal.pdfIn PDF document text
    • http://litorow.myartsonline.com/44332160244.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/xuregesiragu.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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5444 bytes
SHA-256: 887ecf3ed108da64cc1c44e2e88d89ed3f8345af44caf787385a24cecc964fd8
font_01_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10236 bytes
SHA-256: 7357c3d95d430ca6cbba1562e5103f778d23c0c47676035d9d29a1b683e0db5f

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