Malicious PDF — malware analysis report

Static analysis result for SHA-256 489a9729ed6b76f8…

MALICIOUS

PDF

89.8 KB Created: 2021-02-25 04:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8e9a6e9947fdfa79495795c55e11477f SHA-1: db30bcd2d13fb0477bb23be863594575fd52ad50 SHA-256: 489a9729ed6b76f857b4509683f9153584e3e40953ffc31fd35640493f19df00
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=descargar+pelicula+tres+metros+sobre+el+cielo+parte+3 PDF link annotation
    • http://ritual-venki.online/what_is_direct_proof_in_mathematicsp9fl8.pdfIn PDF document text
    • http://arboozfilm.com/dixabulapanoxuwojofu59req.pdfIn PDF document text
    • https://wofugegiperezaj.weebly.com/uploads/1/3/4/5/134528457/9161969.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/ggAidhc/lewafuvobifupuvitetuwa.pdfIn PDF document text
    • http://mon-cmbretagne.best/annamayya_telugu_movie_free_hdhve7k.pdfIn PDF document text
    • http://sparzha.club/vixotutow4gf2r.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/eLsZeAJ/36411876817.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/4eca04.pdfIn PDF document text
    • http://milky-rp.space/marriage_morals_in_islam89neu.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/bgiV6SL/93744237779.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ihEhheo/kung_fu_panda_3_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daxemo/dual_antiplatelet_therapy_guidelines_2019_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/10_000_reasons_by_matt_redman_music_download.pdfIn PDF document text
    • http://fekovip.rf.gd/irs_form_1040_schedule_a_2019.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_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 5556 bytes
SHA-256: 096db5c1a75723a67cdf071195c58560fd7ebc4d4c2ffb6ab02d9f0dbc096b6c
font_01_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 11896 bytes
SHA-256: 332d273d5a3aa3d2e4f4bb66de04d8dfe221c779cbd5a1fc8702d684fc36a322

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