Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbbf8abf65c5866…

MALICIOUS

PDF

78.9 KB Created: 2021-02-11 20:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d9ef9719bf8729b0979d611fd49f7685 SHA-1: 7be80af5a2fdc301fcfd4c972020060ea79203d3 SHA-256: 4fbbf8abf65c5866c8a40c1f892177e4e41cf4a6c356c33d2f42174eb679142e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=spyro+night+flight PDF link annotation
    • http://jirapunobos.22web.org/sepsis_icd_10_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/ifjgShj/wazinixi.pdfIn PDF document text
    • http://edapog.online/behan_ka_pyar_na_ruthe_ringtonew9bh4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5fd7c64d28b24.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/KBWeMid/school_of_dragons_mod_apk_2018_download.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/dNE4jjc/98980127668.pdfIn PDF document text
    • http://italia-doc.fun/livable_house_design_guidelines16yzv.pdfIn PDF document text
    • http://digtalcaliper09.xyz/free_heart_templates_for_appliquefajet.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/az5jinX/boutique_wedding_venues_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_600a9eeb71a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5fd680d8c3a40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470821/normal_5fca70c781ad1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimitafukufes.rf.gd/bellavista_1000_ventilator_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/asphalt_8_cho_pc_full_crack.pdfIn PDF document text
    • http://kedokonox.rf.gd/sample_of_acknowledgement_for_assignment_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 3624 bytes
SHA-256: b15c259b553f27acc2d3194ff9e8ecf5acb8fd844a766b5d35deaeebb37c8b2f
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 4980 bytes
SHA-256: 4a0ffff732006562c548e31890ee5c3d5b26e51c21aa2eb952efadb3dcdac0f4
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 12748 bytes
SHA-256: 5d61febaa33b25182b2e425492d6426a01f0eedcc3a9db279871f47f308356b8

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