Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93bb6cab55001d6…

MALICIOUS

PDF

86.1 KB Created: 2021-02-24 06:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7323533ac34333ab9d28b2de00bc4c9b SHA-1: 27aa4fc8dad8f869a8431551774605cfb38092f9 SHA-256: c93bb6cab55001d6da9bed2d462d6453d33a793bc27cda69b33698280a106427
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=why+was+the+treaty+of+s%25C3%25A8vres+replaced+by+the+treaty+of+lausanne'. This indicates the document's primary purpose is to lure users to a potentially harmful website. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', further supporting its malicious nature. The ML classifier also strongly flagged this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=why+was+the+treaty+of+s%25C3%25A8vres+replaced+by+the+treaty+of+lausanne In PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_60022671b15a6.pdfIn PDF document text
    • http://neyroskakalka.site/63965916289gxzty.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/ma_admission_form_2019_lucknow_university.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5feed371d0382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_6015743726d2d.pdfIn PDF document text
    • http://lumacy.site/18825637597ne93q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fdb98515ab7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_6008bfc40d583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_6000fa144493f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_60354d6528132.pdfIn PDF document text
    • http://naturalik.fun/how_to_do_trigonometry_with_an_isosceles_triangle5lpba.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/boxujetanonikuv/2019_disneyland_halloween_food_guide.pdfIn PDF document text
    • http://tafinefonekon.rf.gd/postcode_lottery_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/concepto_de_ambiente_laboral.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/how_fast_does_apple_cider_vinegar_whiten_teeth.pdfIn PDF document text
    • http://somizifiwij.epizy.com/lay_down_your_weary_tune_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/95033290211.pdfIn PDF document text
    • http://wulitebajanuba.rf.gd/can_solve_this_30_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/compound_subject_and_compound_predicate_worksheets.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_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 5792 bytes
SHA-256: 44002e118dacc15b8a29233a8ad0180a21f623d476216224df70f43edca11ef4
font_01_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 11604 bytes
SHA-256: bdd8c7159b7cd41673f335ace064ce99434f77a521d9e148c0f18550c29850d7

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