Malicious PDF — malware analysis report

Static analysis result for SHA-256 b492901f284c9edf…

MALICIOUS

PDF

72.8 KB Created: 2021-03-18 10:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c0ef5cddef5bc28f82d7685982393410 SHA-1: 2fe7f6d3dabb5988e03521b8748c37721574683e SHA-256: b492901f284c9edfe54f628778bdc4527e9d53cf2ebff65b4794fc7f654ed9a4
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. It contains an embedded URI pointing to 'https://maypoin.ru/strik?utm_term=english+vocabulary+tests+with+answers', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, suggests a lure related to 'English vocabulary tests'. No scripts were extracted, but the presence of malicious URLs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

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://maypoin.ru/strik?utm_term=english+vocabulary+tests+with+answers PDF link annotation
    • http://ionatr.fun/69767189260bhv9g.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/how_to_make_money_in_stocks_book_depository.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/nazipaxituwosopufesebeti.pdfIn PDF document text
    • http://govegejemoluf.iblogger.org/liwamenipi.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/what_taco_bell_menu_items_are_being_removed.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/what_is_the_keto_reset_diet_plan_to_follow.pdfIn PDF document text
    • http://helper-badges.com/1421458599upag0.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/64454973268.pdfIn PDF document text
    • http://mediaverifiedbadge.com/bugunesixugebum1k76a.pdfIn PDF document text
    • http://gravkamen.ru/binary_addition_examplesi3fln.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/mogofave.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/tizowodifi/afforestation_all_information.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/acls_2020_free_download.pdfIn PDF document text
    • http://lopesexam.epizy.com/2039363575.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/99054694850.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/devexpress_end_user_report_designer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/58352851428.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/zkteco_access_control_software_5._3.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/46317446008.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/52491002041.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/58108703117.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/rv_fridge_not_working_on_electric_or_gas.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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 5412 bytes
SHA-256: 369d86661063fe85395402e7bdff2afd4d2c5b5dc681312cf629ca884a654b79
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10764 bytes
SHA-256: 090db25ed9dec307d522b2cb04823d860563b0a97f82af928e5b414ed4bafd22

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