Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb4629aef424a46…

MALICIOUS

PDF

84.3 KB Created: 2021-04-17 19:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e046ebab7fbe8b48bc8baa7bcc060871 SHA-1: e93dcf9d12cc529c6335a9b0871df69304c3ea09 SHA-256: fbb4629aef424a46c12cd90a10750b5edcbecbec290fff538ab1f092c4099576
116 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded URLs, with the primary one being `https://jottigo.ru/strik?utm_term=how+to+handle+conflict+at+work`, suggesting a phishing or social engineering lure. The malformed stream length heuristic indicates an attempt to hide malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jottigo.ru/strik?utm_term=how+to+handle+conflict+at+work PDF link annotation
    • http://zawugudumi.getenjoyment.net/muzeriki.pdfIn PDF document text
    • http://kizadunejin.22web.org/42415236163.pdfIn PDF document text
    • http://goxaterajeronaf.22web.org/adobe_acrobatmaker_add_in_word.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470232/normal_5fe20ee773f0f.pdfIn PDF document text
    • http://pevetune.66ghz.com/financial_ledger_template_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_604b587a843d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_60564647d59a3.pdfIn PDF document text
    • http://pifozuvarivin.22web.org/60015114853.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/bitizopovopaso/car_aircon_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/kasikonimosokod.pdfIn PDF document text
    • http://napamewa.atwebpages.com/nenegikibomajekulovopo.pdfIn PDF document text
    • http://vebobutakozok.rf.gd/clinical_trial_phase_1.pdfIn PDF document text
    • http://tegemikewik.rf.gd/guide_michelin_restaurant_figueres.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/nobawazokij.pdfIn PDF document text
    • http://jataluwapimose.rf.gd/adobe_flash_player_11._0_0_gratis.pdfIn PDF document text
    • http://tomosuromiv.epizy.com/american_english_file_4_workbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/stanley_1000a_jump-starter_manual.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/author_s_purpose_lesson.pdfIn PDF document text
    • http://gufaxepelirub.rf.gd/topexebarugironejoril.pdfIn PDF document text
    • http://disoluje.myartsonline.com/biology_questions_form_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/wupufamunemazizatexijer.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/why_doesnt_my_microsoft_wireless_keyboard_work.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/45991280245.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 5048 bytes
SHA-256: 0cb68f5a8c2656a95175364b183726051f159f1b790e10b8273612a650214ce2
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 11324 bytes
SHA-256: de5f292b817f528bd9e762b611cfcc99b3b06538cc293483a6c2a1a7b9301c3e
font_02_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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