Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc68625623cdf55…

MALICIOUS

PDF

79.8 KB Created: 2021-03-01 17:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d95b8f6bc1d4fe738971e9eeb5e641b0 SHA-1: 1122c1eb3d88273066bbb17217297ed6157fde33 SHA-256: cdc68625623cdf556bef795e2a1b6d06da5f6dca627e87687a31350f62af320b
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. A critical heuristic identified a link to a known malicious redirector infrastructure at 'https://yafferge.ru/123?utm_term=assuntos+de+historia+cobrados+no+enem'. This suggests the document is designed to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=assuntos+de+historia+cobrados+no+enem In PDF document text
    • http://lofajemami.sportsontheweb.net/what_are_the_specials_at_subway_today.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/98389890006.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/what_happened_to_thomas_the_disciple.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/best_books_for_yoga_teacher_training.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/epson_wf_3540_maintenance_box_replacement.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/nazekisigiduz/cot_bed_mattress_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/scratch._mit._edu_2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/free_diy_bridal_shower_invitations_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/bruges_belgium_visitor_information.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/xbox_360_codigo_de_erro_8015d000.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/nofapozamesesotodin.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/sukon.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/68033409767.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/slip_sheet_for_tile.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/sagafimeka.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/94517227890.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/department_of_education_safety_report.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/assembler_des_documents_en_un_seul.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/best_free_stock_market_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/39181936818.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5276 bytes
SHA-256: bd5a5db48f2852a7039cc57507cbe58e6b54cfae4629ae8f2933a995cd327504
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off000107fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FD 13056 bytes
SHA-256: 5ac42e3398bef789258ebee1a5abc009300347a259478e83a291ffc49001a1cf

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