Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f46d5fe77fe0cc3…

MALICIOUS

PDF

72.4 KB Created: 2021-03-02 19:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 111c6093c64f6d3b2076d6c5f236a9cb SHA-1: 42dbb059f53ba5e9313b027003a380f12ddcf2a9 SHA-256: 8f46d5fe77fe0cc341092234828f6f7d87ed3a033a630c7caaee5c6697df54ca
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of 'wkhtmltopdf' in the metadata and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wb?keyword=what%20are%20the%206%20month%20milestones PDF link annotation
    • https://rupusuji.weebly.com/uploads/1/3/4/8/134878943/bibesiwe_liwolet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_603154598923e.pdfIn PDF document text
    • http://lbaranaydin.com/34_851dhxw.pdfIn PDF document text
    • https://cdn.sqhk.co/dipasupor/gjWhgaY/war_box_office_collection_koimoi_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/L3v9ahi/5071701927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5fc859a83470a.pdfIn PDF document text
    • https://xomugiwonin.weebly.com/uploads/1/3/4/2/134266294/bddcc90f6c.pdfIn PDF document text
    • http://titanof-filtr.ru/aprender_ingles_en_linea_gratis_para_niosscf2c.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/wakaferejal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sosipumetivebo.epizy.com/is_wealth_tax_a_good_idea.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/sojegewovawubisetumuzaf.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/carmina_burana_partitura.pdfIn PDF document text
    • http://nadowitumo.rf.gd/40556588693.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/how_many_calories_in_one_dunkin_munchkin.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/what_are_singular_and_plural_called.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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 5092 bytes
SHA-256: c84af2a18fb6fb9bb1cec5b6b1d2c0b1f4dc690f25e59fce596fd5308a7995ad
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 11384 bytes
SHA-256: 1b659bec3252e5c61603c2a8c1361a918faf017e3c0e6dada7c3354d192493a3

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