Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36c1c550d23d3c5…

MALICIOUS

PDF

89.7 KB Created: 2021-03-22 22:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a1532164feb43f2fd9e0011beed35089 SHA-1: 8542747382d62e6421f97893aeeeaf9d23a21ff0 SHA-256: d36c1c550d23d3c5288e022df743ab30917ab8036433211bdeeb4aa270645a60
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are commonly used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=is+timex+weekender+waterproof PDF link annotation
    • http://jiwabozaxexe.mypressonline.com/redumo.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/the_coding_manual_for_qualitative_researchers_second_edition.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/yasser_seirawan_winning_chess_strategies_download.pdfIn PDF document text
    • http://jefozogez.66ghz.com/28737052904.pdfIn PDF document text
    • http://masovizifuzaro.iblogger.org/12390834863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovewerabarev.rf.gd/94190500215.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/bazaart_pro_apk.pdfIn PDF document text
    • http://jifurixinomox.rf.gd/50333553099.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/13007752274.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/41199376649.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/goxutanudifaso.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/treble_clef_notes_worksheet.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_b2f9bc24817643c0b744553b550d1b24.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_247df027c6984464899720c7b3f9f772.pdf?index=trueIn PDF document text
    • http://xuvufajozurez.rf.gd/bissell_proheat_2x_premier_parts.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_17876d44aea24edb81f2d10db1a49760.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_0aa69eeba54c4ebab3d10581fd2b31ea.pdf?index=trueIn PDF document text
    • http://lapetagalelan.myartsonline.com/architecture_of_computer_systems.pdfIn PDF document text
    • http://batapijas.myartsonline.com/zowowawafejuzumugevu.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/zakadeperurodemivi.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_920ed9ca9bf8486abaab84073afea7ea.pdf?index=trueIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/25524382802.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/gender_of_nouns_worksheets_for_grade_3_with_answers.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/how_old_do_you_have_to_be_to_work_at_kung_fu_tea.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_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 5316 bytes
SHA-256: 33414f0d19f8297b3ecf365ef14e56ef67c01141424e5cbb7f6913f6b98e2a6a
font_01_sfnt_off000130ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 11704 bytes
SHA-256: 09c856c842843b39c895f1028c94f8f1ebddb119939f77b79c5bedf0a6868281

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