Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bd10cb1268a633…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 09:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ab1e9dd48fe6c29da7af462cf3f6b0a0 SHA-1: 5c1831e818fc0ec54e5bfeb7c6f12fd6591a8a4d SHA-256: a5bd10cb1268a6338c5dd36a035514d077355c8654cb892e88bc6d0bce895d87
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 0.9960

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://seumenha.ru/strik?utm_term=how+to+read+the+book+of+enoch PDF link annotation
    • https://cdn.sqhk.co/letijefa/cggNji7/wildcraft_animal_sim_online_3d_play_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/g33ghbq/meningitis_bacteriana_colombia.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/critical_analysis_of_the_lottery_by_shirley_jackson.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/45232009085.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/gogavijema.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/hcHdjdC/28594193331.pdfIn PDF document text
    • http://disozire.mygamesonline.org/60598278247.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/what_are_the_different_types_of_framing.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/autocad_2020_3d_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/2OjgjaC/wasujunifubuzirilodarexi.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/35043215802.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzememub/hhjbnO4/responsive_email_template_html_using_table.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/top_selling_books_of_all_time.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/jemisajoda/customer_feedback_report_meaning.pdfIn PDF document text
    • http://bepofitome.rf.gd/coronary_artery_disease_ppt_template.pdfIn PDF document text
    • http://dufatiji.rf.gd/faxujuruginiborurerevem.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_8ddb3bf84de44adf8aac71bd1b926148.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/21497268603.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_0b113e2909994a1c9102929106a76ef4.pdf?index=trueIn PDF document text
    • http://nojikigor.myartsonline.com/kezoputuzagixolel.pdfIn PDF document text
    • http://jomozaredid.rf.gd/burnout_game_free_for_pc.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_f4b68058f9df4ee5a4f077ac72de5644.pdf?index=trueIn PDF document text
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_a2cf0402ea2648b984755592e83c4e55.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_b18c663b097d40b6aa373f131b089eaa.pdf?index=trueIn PDF document text
    • http://jupasugego.rf.gd/notalamewukozavuw.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/28166554409.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_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 5156 bytes
SHA-256: d648c9f927279fc5c5fecf8c366d18b847d6096e61ac6c795fe1f037db9f8f1d
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10604 bytes
SHA-256: 0bf6bb32a8998b6ff31de8697619eb2b0a28c352821a689a8399a97c63e77fe3

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