Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f8f3c1ecbae1c8…

MALICIOUS

PDF

102.7 KB Created: 2021-03-23 22:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e980afcc3a3cc73343ab74bd3abd35ef SHA-1: 846e3fca529732d1f405a4fd7cf67fc9b82f2281 SHA-256: f9f8f3c1ecbae1c8636a88053b2bef315e16821c91433079de0db9a3f2108787
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=acls+study+guide+pdf+free PDF link annotation
    • https://cdn.sqhk.co/lipetebo/RTr9lhi/58099972905.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/ijKjaTA/my_singing_monsters_hack_tool_no_human_verification.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/2723816.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/ehiThfi/paintball_gun_kit_canada.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/bujogulanigubebogif.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/moxitilemifanemo.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/5860823.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/mimojuv.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/WhejG4a/dusixasunidoritobivuz.pdfIn PDF document text
    • http://women-ita.space/tutebivurodewusirokixkd7jg.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/godipivibi.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/valiloxubos.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/calidad_segun_autores.pdfIn PDF document text
    • http://websecurer.tech/3d_logo_design_app_for_androidvex5q.pdfIn PDF document text
    • http://nonretloli.site/nikah_mata_meaning_in_urdugwehg.pdfIn PDF document text
    • http://wonizojaru.scienceontheweb.net/77673039458.pdfIn PDF document text
    • http://buylettersonline.com/ravubujonaeximp.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/winataradeta_movasi_gatona_vaxizudakadu.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/akrhd8G/car_parts_advisor_apprenticeship.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/hhQjhoy/xirizab.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/art_and_answerability_bakhtin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00015411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15411 5204 bytes
SHA-256: 0a529afa6975bffb21a7ae12e3b9cc6cd3ef46e8196b4b1c7b8cf25b8f6bb55f
font_01_sfnt_off000165e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E8 11448 bytes
SHA-256: e12e164c6aec025ebe417ce342f0c007a4b1962a3a90fd399627493dd50606bf

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