Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdb1d559cd40ddc…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 07:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c7c82924c513a404a4d6e826ae6137b0 SHA-1: 103f1dfe380fc8c1eab7d385cd60d5ab950c55fc SHA-256: 6cdb1d559cd40ddc69127eb5e7042100699575b35880b449ed15009c162ca69f
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 0.9996

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://baarspo.ru/award?keyword=ielts+academic+reading+vocabulary+pdf PDF link annotation
    • https://cdn.sqhk.co/pedidagow/y75jige/extreme_car_simulator_2016.pdfIn PDF document text
    • http://difemetudanad.22web.org/najubusopusavonuxipaji.pdfIn PDF document text
    • http://vinezusazal.iblogger.org/what_questions_to_expect_in_a_college_interview.pdfIn PDF document text
    • http://xovoxovija.iblogger.org/general_mental_ability_test_questions_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/jebqjdJ/waxuketurib.pdfIn PDF document text
    • http://gulidomirebo.22web.org/which_course_is_best_java_or_software_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/3ja4het/instagram_followers_increase_apk_free.pdfIn PDF document text
    • http://detodefinedex.22web.org/dissertation_project_report_on_recruitment_and_selection.pdfIn PDF document text
    • https://cdn.sqhk.co/mikoduper/dDhfjcv/xewupibijusavuwogotalije.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://s3.amazonaws.com/fidobakipivogit/41525535785.pdfIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_d86ba9dc005245668de5af212021f407.pdf?index=trueIn PDF document text
    • http://lutilusomufele.epizy.com/ambulance_driver_job_description.pdfIn PDF document text
    • http://zezilometup.epizy.com/bseb_full_form_name.pdfIn PDF document text
    • http://fipaliwabalutu.rf.gd/segekexilubasoweli.pdfIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_e39f5b5ca036444a9e72f2ca41c83076.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_214fcb54e1b24e0aa77b12f6fd810841.pdf?index=trueIn PDF document text
    • http://kilatigavof.rf.gd/monoalphabetic_substitution_cipher_example.pdfIn PDF document text
    • http://topadut.epizy.com/bayesian_statistics_course_notes.pdfIn PDF document text
    • http://dodemupisam.epizy.com/27553163435.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/akshaya_lottery_result_today.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/psp_emulator_apk_apkpure.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_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 5596 bytes
SHA-256: 15dc05fb4f9784c125350897ccf6485d4842067163d28164a4dd06e4b9bc82af
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 12472 bytes
SHA-256: 9b9281d7e8baecf3c5bfb3de588fb9dffcb9e04362fa02eb1b9a4cb7f1dd74b9
font_02_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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