Malicious PDF — malware analysis report

Static analysis result for SHA-256 1341f31ef2634d58…

MALICIOUS

PDF

81.0 KB Created: 2021-03-28 12:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee346b97f59e7ac498fa8760d4fa0b7f SHA-1: 7676875c9859fc32f5942662d97df8e234677182 SHA-256: 1341f31ef2634d583e0118e05ff776dc98382597fd3fbb372efdcf8a99f85764
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 0.9998

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://xajibur.ru/award?keyword=aiag+ppap+manual+pdf+espa%25C3%25B1ol PDF link annotation
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/nixuli_toxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/chhjiif/sofudezononafebik.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/hesCchd/76568852021.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/preparation_of_heterogeneous_catalysis.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/ibhcCEd/amazon_alexa_echo_show_8_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/ha8hgjc/giving_money_as_a_gift_tax_free_australia.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/1724671.pdfIn PDF document text
    • https://cdn.sqhk.co/tusujoxaseru/jm3ifJa/tomcat_heap_space_error.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/ibps_po_application_form.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/butterfly_valve_catalogue.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/sowimo.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
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_dc5a89adf31041799d8b78a17338d41c.pdf?index=trueIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/bsc_1st_year_books_in.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/autocad_viewer_free_download_windows_7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/chittara_moodo_veleli_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/uniform_cost_search_in_python.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_ba14e1213c9d442d9030f6233f2cc3b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xurixado/xujitefebemegukiguporubav.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_8535aacdc9d24b8c9a081b9b3de80ba4.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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 5268 bytes
SHA-256: c26f8438c879da6d0e98e62d12386068026bbe69cdce4d528cbfdb83200d4d71
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 10860 bytes
SHA-256: 1997f37a2ef4cff014913c3092c67e6135c75d08e374cf47e33e45282e1b8a6e
font_02_sfnt_off00012678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12678 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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