Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37e9598d9d5f706…

MALICIOUS

PDF

72.7 KB Created: 2021-02-23 21:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6a081355a84a646b8a908205bc54b35c SHA-1: e07cfc364113b42364ac02aaa0b744d12baf4fc3 SHA-256: a37e9598d9d5f7069d4da2113d0908eeb205b58afa020b0d66f2acac06cbc43f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lead the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=words+start+with+if PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426697/normal_6020531a5ae49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5ffc98034b96a.pdfIn PDF document text
    • http://bcipreactivaperu.com/gidakaxuzasapalakareg8i0f.pdfIn PDF document text
    • http://idealica-ituficiale.website/suferekaxo9ot3u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_6034ff802edaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5ff6bdea122fa.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/3jbihrj/interesting_facts_about_yourself_for_work.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_600c72fcdbaa5.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/rlUFPjf/k12_careers_salary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493867/normal_5ff7eabed9e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fce987467a05.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/ronun_nituzaxoxorid_tulonuv.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/mirtazapine_15_mg_for_sleep7lz37.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/ribafarolofaxidafide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_5fd7899a8ef00.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/6606921.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/hhcJgjj/38761163374.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/fomaralunex/vcds_18._9_china.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/macbeth_act_1_scene_2_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/link_market_services_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/aashiqui_2_all_video_songs_hd.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 5068 bytes
SHA-256: 7c8c70c761d90e86657161b489eb5e3cbc563dc9153dc3ff0fa405a6ab6f28c4
font_01_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10228 bytes
SHA-256: e655194909396e22ee88f2a462b37b22c00b22c2920d91674b6784b78a0b5715

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