Malicious PDF — malware analysis report

Static analysis result for SHA-256 5900f6fa1ba4eaea…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 08:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a090b3423a9dd9b3e383bac22b2b1da SHA-1: e8e8200bf55b8151cffebc821047ffcdc8a248da SHA-256: 5900f6fa1ba4eaea031132390aa95ddceb8d7028835f7f8dc4d62fbd7bc7c2c7
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing trojan. It contains an external URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into visiting a malicious site, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=monolithic+structure+of+operating+system+pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_604adcfe5c7a1.pdf
    • http://setokanekema.mygamesonline.org/2008_acura_rl_transmission_problems.pdf
    • http://sasegotib.medianewsonline.com/scheduled_caste_list_in_andhra_pradesh.pdf
    • http://kapabifidi.sportsontheweb.net/cambridge_checkpoint_english_workbook_2_answers.pdf
    • http://kirivil.iblogger.org/was_brandon_burlsworth_a_real_person.pdf
    • http://wutoxurusot.iblogger.org/easter_bunny_mask.pdf
    • http://joritirumag.mypressonline.com/anthology_of_classical_arabic_poetry.pdf
    • http://bigpleasure.ru/which_is_the_best_carpet_cleaner_to_renthd9wo.pdf
    • http://tajuliwelofiti.medianewsonline.com/mesuwagajofive.pdf
    • http://gizejiparo.iblogger.org/baseball_hitting_drills_for_a_batting_tee.pdf
    • http://kuboduzuke.mypressonline.com/bulletproof_diet_shopping_list.pdf
    • http://businesshelpservice.com/what_was_the_outcome_of_the_second_great_awakening86spk.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5fd1cb47dcd7c.pdf
    • http://nunovoxiwanafuz.getenjoyment.net/why_did_the_magna_carta_become_so_important.pdf
    • http://foxilajat.sportsontheweb.net/national_aptitude_test_in_intelligence_sample_papers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://boripodadup.epizy.com/bipaj.pdf
    • http://nabulegewuwal.myartsonline.com/i_ready_grade_4_math_book_answers.pdf
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_424ca616773648eaa9a7b85643f05ed9.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_4f02426b8e8e411a9a39c0a47fd1a9e4.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_2ec6d8aeb4ac43e8a51e8ea33d25d369.pdf?index=true
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_12275094cb8947ccae207acdc00d30e6.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_3f77f28052f848ee96e71b22b0485d2a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f8.bin
2816c7fdf535a678a31e8590912ddb7b3a10dc9f26221abff1fc0ff8506f8f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 5676 bytes
font_01_sfnt_off0000fd2d.bin
bbe71e5a57f9a833b4febd0d3d9cf66856e856c103e51e7b6ec480cc81508618		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 9896 bytes

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