Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9bd4bb15ca58c2…

MALICIOUS

PDF

93.1 KB Created: 2021-04-05 08:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57c9699c95025f9a2a359564b88a6f3 SHA-1: 7074a42bb7e0e4e493d8ac475232aef1e03c2ad0 SHA-256: 7a9bd4bb15ca58c2aa938c34894dabe799b5b21668ba255ccf766b8426589e97
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet answer key', likely intended to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://seumenha.ru/wix?keyword=meiosis+review+worksheet+answer+key
    • http://vertigoa.online/gubivizuxadeclkgo.pdf
    • http://sedouche.xyz/the_way_of_the_master_study_guideed7x1.pdf
    • http://mosiruduv.22web.org/6401045721.pdf
    • http://pisifivomi.22web.org/verizon_fios_support_phone_number.pdf
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/nerebosabusamis.pdf
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/7937406.pdf
    • http://sejapamuji.22web.org/sinezunewosixanovem.pdf
    • http://duperalenow.22web.org/95723157268.pdf
    • http://vinnipoh.space/car_parking_and_driving_simulator_hack_mod_apkziabp.pdf
    • http://zorimiba.iblogger.org/carnatic_flute_learning.pdf
    • http://pisozuzata.iblogger.org/30902103424.pdf
    • http://apeech.ru/used_hobart_handler_190_for_sale27rzo.pdf
    • http://blockhcain.host/nixon_mini_blaster_user_manual9urse.pdf
    • http://fruit-italy.space/dr_jekyll_and_mr_hyde_summary_of_chapter_5nadzx.pdf
    • http://cashbackk.site/great_by_choice_triangle5xrw4.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://vefuxeromuriwir.iblogger.org/diwepefematisukonakize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bazuteterikop.rf.gd/solving_and_graphing_linear_inequalities.pdf
    • http://jelamadigeg.epizy.com/beauty_queen_game.pdf
    • http://kitasiru.epizy.com/performance_appraisal_phrases_on_productivity.pdf
    • http://lewiwoladizot.rf.gd/68651988596.pdf
    • http://boxitevu.rf.gd/faithful_victory_worship_chords.pdf
    • http://memaded.epizy.com/posap.pdf
    • http://nuwixunosozi.epizy.com/vuxerejaliweluwe.pdf
    • http://novuvajuvenexe.epizy.com/public_speaking_anxiety_research.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f32.bin
3943156f4f32c354acb7938e7306015d2a57f9224c490a3fef4f4c84ba25ebcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 5064 bytes
font_01_sfnt_off00012082.bin
c0b080a3303b8e939d585112c399c02879d5f0d732e84daf845a916286948345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 2116 bytes
font_02_sfnt_off00012a2e.bin
17a161f019c18586f6436c73127c65286c7b512eeab51583ab9f6f8f6a4a5e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 11324 bytes
font_03_sfnt_off00015080.bin
57cc76c5d0821ee651784b05a7a7e6780fe5113b8f4359c05205522d11f96342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15080 16148 bytes

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