Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f54c56d6e23456b…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 20:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3832ef75233cd9d3d553725218efd631 SHA-1: 09ba2bf5decd6c207922cf27aaa5af186bb05571 SHA-256: 1f54c56d6e23456b2e4864bd5d3c03f2774831969f92dc9b6098c3780e47a6c3
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a query about capitalizing Spanish school subjects, which appears to be a lure.

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://leonvi.ru/award?keyword=do+you+capitalize+school+subjects+in+spanish PDF link annotation
    • http://mutujejeturuduf.medianewsonline.com/world_politics_trend_and_transformation_17th_edition_free.pdfIn PDF document text
    • http://wavarev.22web.org/illinois_file_llc_annual_report_online.pdfIn PDF document text
    • http://tamakar.tech/html_ecommerce_templates_githubvbqb5.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/fibomerutafasodafujigirid.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/jisenig26fuy.pdfIn PDF document text
    • http://cardioactiveufficiale.site/android_admob_developer_guideu4zoj.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/black_and_decker_handy_steamer.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/buzadizo.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/56179999698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozifaganepele.epizy.com/how_to_fix_ge_washer_that_wont_spin.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/research_about_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/71082500560.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/lg_washing_machine_top_load_user_manual.pdfIn PDF document text
    • http://roragopijejem.epizy.com/zedaguzijarigovozanagaxor.pdfIn PDF document text
    • http://kinikodiraxo.rf.gd/marvelous_designer_cloth_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/68842998682.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/50573432311.pdfIn PDF document text
    • http://wigegamumuxan.rf.gd/navedorivikuvedafasegejo.pdfIn PDF document text
    • http://dimazobuxijema.epizy.com/zabolejasewigudutu.pdfIn PDF document text
    • http://joruvone.epizy.com/antigona_cela_lektira.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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 5292 bytes
SHA-256: d58fbbccda13c48a1da2fd7cad49c782f3353420308462432cce87236e946798
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10240 bytes
SHA-256: 07775fd196bbd7d1a1847d6fa98882330f8fb6f95d2ab31c90364858df4ba445

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