Malicious PDF — malware analysis report

Static analysis result for SHA-256 5347739d2675dc86…

MALICIOUS

PDF

79.1 KB Created: 2021-03-26 04:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7c35b48ae3bada0301002c33fb349ef9 SHA-1: b9fa6b575719dbf7e143fcce04f4b0b8da700377 SHA-256: 5347739d2675dc8689f4958b4a7dabbb9134b765ec6fda958a0a106009461a42
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/award?keyword=effects+of+bullying+on+students+academic+performance+pdf PDF link annotation
    • http://bonugonir.22web.org/3042057013.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/rolukopusegezefosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450898/normal_5fffe977bd8ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_60029696b6a34.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/L8hi6ij/79241660979.pdfIn PDF document text
    • http://kobazugipodiv.medianewsonline.com/baba_yaga_and_vasilisa_the_brave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_602106e7bdb08.pdfIn PDF document text
    • http://vukosam.22web.org/fishing_sim_world_ps4_guide.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_to_prepare_a_vegetable_garden.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/pjc14ja/blackplayer_ex_music_player_apk_20._52.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/aNw7jiN/28747578804.pdfIn PDF document text
    • http://niludop.22web.org/solobanupasonepiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fce82066243a.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/ximupuv/notusavikutu.pdfIn PDF document text
    • http://sadubobuzol.epizy.com/18578767879.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/98624901106.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/shooting_games_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/procedimenti_cautelare_uniforme.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/pokmon_ultra_sun_and_ultra_moon_-_complete_pokdex_all_qr_codes__shinies.pdfIn PDF document text
    • http://zidumive.rf.gd/mariadb_tutorial.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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 5676 bytes
SHA-256: e1a8f3e83967406a161a6ab56edc54cfb4b21a5438d7d40e5a9c360e6ed95a04
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10820 bytes
SHA-256: 6f9fa4668598a997c1a762413f4e29f5258e7a62a07bf1bb41a466354cac1640

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