Malicious PDF — malware analysis report

Static analysis result for SHA-256 159f2a149adae0d6…

MALICIOUS

PDF

89.1 KB Created: 2021-04-10 23:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 654ad9af71f104feb27087478bcf1deb SHA-1: ebd87552eb1a11000e5e41dcb185efeee99f1927 SHA-256: 159f2a149adae0d6618e74742e332bcc01ba3778d8fbca9ea1e012fb1c24d31d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=physiological+factors+affecting+nerve+conduction+velocity PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2c01dd1f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389824/normal_601f83ccd0e75.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/gesscA7/what_is_my_smtp_server_name_for_outlook.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/hijmxCy/loopback_for_windows_10.pdfIn PDF document text
    • https://numokupe.weebly.com/uploads/1/3/4/8/134857704/28080e1.pdfIn PDF document text
    • https://xitosuwoga.weebly.com/uploads/1/3/3/9/133988858/novimuwixawade.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/pusunasaxeluzorajugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5ff040a2c1363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fe676c92ab0a.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/gapamojorusoxuximo.pdfIn PDF document text
    • https://lixumubol.weebly.com/uploads/1/3/1/3/131384516/xisoju_megudedig_demuxegamokoku.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/gofilafixu/cancion_de_hielo_y_fuego_juego_de_tronos_audiolibro.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/fundamentals_of_accounting_book.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_bc3932fcf2724afbb8dc3ed0df93e52b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/como_instalar_camera_de_segurana_residencial.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_d7cc13bb4c81415aa4d191bfcbcf6b45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/tujuan_amandemen_uud_1945.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/extreme_ownership_how_us_navy_seals_lead_and_win_chapter_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/70241954326.pdfIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_707bb9e345934081add934bf05f26fea.pdf?index=trueIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_4d9536e1189a46229b16b1754c2fb97f.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_b784b05b73fc420ead2c950e5760ba09.pdf?index=trueIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/primavera_p6_free_download_32_bit.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_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 5444 bytes
SHA-256: 852cbb96d506d5cc3b3155c3de72cfc9eb217c596f6a086c1343e1b30ff41137
font_01_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 10716 bytes
SHA-256: a62a18eafbe65642e7ea93ab76be20b0cad68a44c09acb36fb7019c89a75a2a2

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