Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f286561729bd0a1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 16:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584872cc0ac55c42a938185f74a58dc0 SHA-1: 7869699a16c76f53f8841d770e484289c384b372 SHA-256: 7f286561729bd0a1d9707464f90706648e9990928b42cfbb5a6e645bbfcdbf68
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL `https://pelibifir.ru/wix?keyword=x+and+y+intercept+worksheet+with+answers` suggests a phishing or malware distribution lure, disguised as an educational worksheet. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs are common indicators of malicious PDF documents designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=x+and+y+intercept+worksheet+with+answers
    • https://cdn.sqhk.co/pedidagow/fc7rw4y/28240853242.pdf
    • https://cdn.sqhk.co/tonuviwa/bicjghb/waxijiz.pdf
    • http://tanenabav.getenjoyment.net/22032794178.pdf
    • http://jubevejazuten.iblogger.org/tactics_greg_koukl_review.pdf
    • https://static.s123-cdn-static.com/uploads/4411916/normal_6007cbacbef13.pdf
    • https://cdn.sqhk.co/zerumowo/ffdsxgg/tilikibotuguvapuvix.pdf
    • https://cdn.sqhk.co/dibirolinu/phjMY05/age_of_war_hacked_unblocked_games_66.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_60170116944a8.pdf
    • https://cdn-cms.f-static.net/uploads/4475727/normal_60319c69ee1f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/piwanisaj/dungeons_and_dragons_4e_character_builder.pdf
    • http://popuzavefigud.epizy.com/mathematics_form_2_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/0c0b741c-5c2e-4db1-a233-41a6edd4b3b6/95057294987.pdf
    • http://vaxesopubowutuf.rf.gd/xexugadoxod.pdf
    • https://s3.amazonaws.com/radubozufiwo/what_is_the_primary_goal_of_management_accounting.pdf
    • https://uploads.strikinglycdn.com/files/695acd4a-edbd-42fb-b56c-610129133227/dapilekusosenosupivu.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/86834148814.pdf
    • https://uploads.strikinglycdn.com/files/7a9e98e6-538e-467d-91e9-1aa764b1d1a4/how_much_is_phones_at_walmart.pdf
    • http://jeborawaleko.atwebpages.com/22229102648.pdf
    • https://uploads.strikinglycdn.com/files/69960adc-1815-4e63-9e61-db0a06e3cbfb/how_much_does_enterprise_car_club_cost.pdf
    • https://s3.amazonaws.com/jixeremipet/98516763718.pdf
    • https://s3.amazonaws.com/patotale/kuditotokemudalifegevoke.pdf
    • http://www.geograph.org.uk
    • 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_off0000e76e.bin
ae9988d989ec6bde8f20523e7bc9f1d6af958687fbb4eaaca2d5f2c8f2cd304f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 5364 bytes
font_01_sfnt_off0000f9be.bin
e62130d2a1aa1be939ebe2eb2b211b2f0ae86465faed668ac1e0735b20b6f438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11236 bytes

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