Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28f9bcbb76371bd…

MALICIOUS

PDF

88.2 KB Created: 2021-03-13 16:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 993c9cff1b6d7afceb48a8cae9310cef SHA-1: 58d4562954b64a7f8525bef2da97dec3500c0285 SHA-256: e28f9bcbb76371bd575c921a1e60a408c5d417b5e7b7266c247198fd28da2bf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/wix?keyword=runescape+meg+answers PDF link annotation
    • https://cdn.sqhk.co/korulifesewa/rjWicpc/chat_color_plugin_1._16._1.pdfIn PDF document text
    • http://xabudumame.mypressonline.com/nitapivatibemigoviba.pdfIn PDF document text
    • http://danoguvu.medianewsonline.com/pdf_file_download_from_link.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/8uifkvb/mishary_alafasy_dua_mp3_free_download.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/delegation_poker_cards.pdfIn PDF document text
    • http://winoorama.website/dewebuze47lg8.pdfIn PDF document text
    • http://ubsvp.com/xuzosukozaluwujuxoxj6o.pdfIn PDF document text
    • http://hs-life.ru/pipirukunatifuwusebowlyv80.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/RnQidgc/gixud.pdfIn PDF document text
    • http://xenotobewaf.22web.org/13285179444.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/ighigje/bricks_breaker_king.pdfIn PDF document text
    • http://eduha.online/g-shock_mens_tough_solar_black_resin_sport_watchc04vk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_27c6f96e55854a6cac98ea09dbc834cc.pdf?index=trueIn PDF document text
    • http://rixibedi.onlinewebshop.net/2003_ford_focus_svt_turbo_kit.pdfIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_1b781c105ef04a88abdcd7d1efc2a5ef.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_0aebbaedbe0442f7b3d94c006d84a167.pdf?index=trueIn PDF document text
    • http://dexedigobejo.rf.gd/the_holy_road_movie_trailer.pdfIn PDF document text
    • http://zazasos.rf.gd/86444078654.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_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 5320 bytes
SHA-256: 62c494a3d54b0a8b8073963b1a092f5aac3ca02e786e45b3a120add5396a8747
font_01_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 11216 bytes
SHA-256: 90bba009d17d8a88001c3aafc96d50eb2dce02d5412f314d028dc580528d2b03

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