Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f48d40df1c27459…

MALICIOUS

PDF

84.1 KB Created: 2021-03-31 00:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40d5d32acc40fa69680aa7cb40c3c563 SHA-1: 8a6cfdf5baa01b01229e932597b38f6759da6c7f SHA-256: 6f48d40df1c27459a5861314a95cbabbe12a66d88e34075396244fd30c986bf5
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 0.9954

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://golowaki.ru/strik?utm_term=how+is+defending+jacob+different+from+the+book PDF link annotation
    • https://cdn.sqhk.co/sowovupo/WfjjRhj/79807764354.pdfIn PDF document text
    • http://dirtygirl.fun/35059707212dctid.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/fijjf1T/free_winrar_archiver_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/haPrtxC/rejowadodepeliturajukid.pdfIn PDF document text
    • http://baltika-trans.ru/674167036880fzx.pdfIn PDF document text
    • http://leree6.club/shockwave_support_poep8jti.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/iaTwhaH/fixupakinoteroporujigunaj.pdfIn PDF document text
    • http://1pokypki.website/16008882089sodyq.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/nidGgv1/driving_school_2016_obb_apk.pdfIn PDF document text
    • http://creditreportus.info/how_to_assemble_a_zebco_202_reelsv3jm.pdfIn PDF document text
    • http://bumaga.bz/389881762553faey.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/bIhDjaK/soxenodufude.pdfIn PDF document text
    • http://electorat.org/fl_studio_12_old_version_free_downloadfb7ju.pdfIn PDF document text
    • http://stnold.com/21576430668zifba.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/grR50hj/twitter_download_gif_bot.pdfIn PDF document text
    • http://spain50off.info/bjd_song_sambalpurirbe3v.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/pbhhpNA/time_management_synonym_list.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/willy_wonka_and_the_chocolate_factory_death_scenesiegsq.pdfIn PDF document text
    • https://cdn.sqhk.co/nogugojuri/6ihQZid/xufumomenakinetifizekux.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://uploads.strikinglycdn.com/files/b6c98939-7838-43a9-8cc7-750b37ee1613/gijiridasinekesegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886b1b18-9283-44bc-bf26-e0f8b57a934d/padofexenuvegidazisezir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce6e30dc-f1e1-4ae9-8d52-a38e55119beb/cat_in_the_hat_book_plot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78899896-7280-42d1-807b-6d977357814a/vermont_castings_intrepid_2_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c2a131-013a-4b0f-9ec4-90972291f7e7/adobe_premiere_pro_2019_tutorial_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fd8d0b-ff25-463d-ac42-bef0732934e6/tonudadidovanitikamirox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61f2c0d-065f-4347-8a25-321200e294d6/90448711104.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 5524 bytes
SHA-256: 23cb660c6e98d543dc5670cfa29bc77704b745b4c82f7a503fb4ea0b20de0f3b
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 10728 bytes
SHA-256: ee857d70ac4b4fcb9971f1888fc2986356d39409d434e187c09be48f8b758f4b
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176