Malicious PDF — malware analysis report

Static analysis result for SHA-256 e663fcf3cfd22f3b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-01 01:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3040aac907990561af3484ca5e495320 SHA-1: 1519b6393a20033fc7c5b4922e2d7c1bda8b61cc SHA-256: e663fcf3cfd22f3b8f719639d012340e6a071bc8499c2b673ffd45a5222e8e69
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=quantum+computer+programming+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489035/normal_600760ca37282.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/ijfb4cf/32136774716.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/8fjhjh5/archer_hotel_new_york_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_600ee75bde83e.pdfIn PDF document text
    • http://erogancolumbia.site/guitar_duet_sheet_music4wxew.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/wufefubokujozobadosodixo.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/5th_edition_character_sheet_apk_premium.pdfIn PDF document text
    • http://madamzero.com/naxagixuzejidazojomile34a4o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_60296e5da76ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_6029671193056.pdfIn PDF document text
    • http://hookup757.fun/how_to_train_your_dragon_homecoming_watch_netflixbtphw.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/JQ1GghZ/i_remember_mama_movie_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377678/normal_5ffe1dc8b38c8.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/IhFheDM/vector_angle_calculator_physics.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/tonemakopinibem/79040377550.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/ski_doo_service_manual_2016.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/77458275819.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/flex_plan_ordering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/vojiwaj.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5532 bytes
SHA-256: 0d77b4f607b1dfbfc68497e88b79eadbc3c8185dbcec12ec81bfee4067fc94b9
font_01_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 10344 bytes
SHA-256: 713f372477079014dd39383d92ddf82628f5a360c77d8f516ec70872574500cc