Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c02d0818819238…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 02:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7503b500249c0193622f26918e0f58b5 SHA-1: 9a724f85407635f8a17d5e24db387feb4875f0ac SHA-256: b6c02d0818819238da066bc3274925ac46b0ace1c28bb454e1ce6dd39a75d28d
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 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://pelibifir.ru/wix?keyword=basic+statistics+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/fejavegiwo/ifjioha/treats_up_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/oyidBjf/44830403154.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/xogagoruzafolavugofulen.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/XjjNLri/pedutaloxuxufeke.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/hdfc_bank_home_loan_application_form.pdfIn PDF document text
    • http://timinome.getenjoyment.net/brother_knitting_machine_spares_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lomolawowetaxu.rf.gd/causes_of_pollution_in_mumbai_city_download.pdfIn PDF document text
    • http://lokanitipurirug.epizy.com/how_to_program_directv_rc73_remote_to_directv_receiver.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_59f3d57720d4450ebeb2b4f583a0e302.pdf?index=trueIn PDF document text
    • http://bewefesa.epizy.com/bukelovem.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_9a60bf0e727340b38e14016848cfe681.pdf?index=trueIn PDF document text
    • http://rerezedosal.rf.gd/itunes_for_windows_64_bit_free.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_019646409ce143ca8f533c025973a67d.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_7fd920bf10e84914914c523b37cb0bcc.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_159a3537342f4abfab1865a16ba3af2d.pdf?index=trueIn PDF document text
    • http://duxegejuw.atwebpages.com/vukipewufimakijowivos.pdfIn PDF document text
    • http://mivurukelino.onlinewebshop.net/20749354037.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_1a0f24d895e2415db00abb0d51a4e384.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_3854495240bc46d6b73687e4a17bee34.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_565c9171ee3941b698aedbfc01438839.pdf?index=trueIn PDF document text
    • http://nabulegewuwal.myartsonline.com/64814736920.pdfIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_c815167ca59b4eaca453a79ccc5c69d1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 5096 bytes
SHA-256: 42fee90f907f4f335b614e8ab71a81c24ef38300d01552906bfd02aa9e7935a1
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 10520 bytes
SHA-256: 2a8b37a3a090db950e112761ef68b80554bbcc6a25ae5da01dd96f19a101d503
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230