Malicious PDF — malware analysis report

Static analysis result for SHA-256 f180104f53c532dc…

MALICIOUS

PDF

79.0 KB Created: 2021-02-25 09:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 545fe306daaed8c23e095da7de9f314b SHA-1: 54584e587a910020ebd203a5a21b57c84e01fd4b SHA-256: f180104f53c532dccd93abb997b9efd87ee37f7311ca04bf4c829a45b239cb9f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to a malicious website.

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
  • 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://jacksth.ru/wix?keyword=que+es+una+tabla+de+contenidos+en+un+proyecto PDF link annotation
    • https://cdn.sqhk.co/fabetojowuje/3fLjaz3/fuzoginejafirosoje.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/zemimozusojupesos.pdfIn PDF document text
    • https://verevivomilob.weebly.com/uploads/1/3/0/7/130738769/a1b41855d461622.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/jdjiSoS/52879534876.pdfIn PDF document text
    • https://zigizawinowola.weebly.com/uploads/1/3/4/4/134457077/4572338.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/40b8401c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5fde589fb12d2.pdfIn PDF document text
    • http://beremoter.online/butterball_indoor_electric_fryer_manualemic4.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/fujaxewoj.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/gejcGhi/odd_eyed_white_cat_for_adoption.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/a_r_d_ka_full_formcu64n.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/13541430003bhv0s.pdfIn PDF document text
    • https://resigigemi.weebly.com/uploads/1/3/5/3/135326159/jubole.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/jhYgi4q/bunny_pop_blast_mod_apk.pdfIn PDF document text
    • http://tusuvopub.22web.org/obligations_and_contracts_jurado.pdfIn PDF document text
    • http://logorag.22web.org/31382886943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutomipana.rf.gd/44595512458.pdfIn PDF document text
    • http://parubupo.epizy.com/mobil_balap_games_free.pdfIn PDF document text
    • http://xosufatobula.rf.gd/ladofuvikosu.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_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 5368 bytes
SHA-256: d3d29783feda37e6a0b7e7a8154fbe53edbda593242e55ed0bdfc299c40f0661
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 11420 bytes
SHA-256: 221eda3b43c9d8bb3c6ec271b035d921d3273a83971c785bc61c7ec43c5c83ca

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