Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e270bdff323e6fb…

MALICIOUS

PDF

81.3 KB Created: 2021-06-02 00:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8fd64c59dd2a88a79612e53f291b18d8 SHA-1: 3ff487b281313eccb04d27daa8f7152567b59397 SHA-256: 8e270bdff323e6fb9e5ee0649a3012b58af64ab4f8390366054ff472465427f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external URIs and acts as a link farm. The embedded URL, 'https://crysiq.ru/pbw?utm_term=summoners+war+mod+apk+5.2.10', suggests a phishing or social engineering lure related to a game modification. While no scripts were explicitly extracted, the PDF format and the nature of the URL suggest potential for embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/pbw?utm_term=summoners+war+mod+apk+5.2.10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fda254e81000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_603fff7632293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_601ef567bd7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527859/normal_604dc6ac1a602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab40c196-4ae4-46ce-8a09-a8ed2fba12bf/beats_solo_hd_review.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144421179/82912538995.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144419778/best_server_for_ark_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9cd88c8-498a-44e8-8396-00f3657f7b2e/short_division_no_remainders_worksheet_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897ffbe9-6cd9-49f8-b8ea-7378143a5e75/the_egypt_game_book_review.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144455688/for_king__country_-_shoulders_official_music_video_lyrics.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144445248/how_to_determine_ground_state_electron_configuration.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144436557/actividades_verbos_regulares_e_irregulares_6_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3451a10e-3e99-4dd0-af82-a60c34c59935/pillars_of_the_earth_movie_series.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/65864740038.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144480510/6.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/30672340839.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/duvatisunutedirigogina.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/f/22076115539.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/what_is_the_most_accurate_bible_commentary.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/15694432467.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/download_any_video_converter_professional_free_full_version.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 5812 bytes
SHA-256: 81b4465ab0f0a5aba336a8fa2be789b1313e94fd2dba1fccb52b6f2d283bb3d6
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 14464 bytes
SHA-256: 5626c41b4f5d28d6a63aba94c21fab4f4405828bc7f3ecd0eb552f1d6ae583d0

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