Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cb3b704c91a44a…

MALICIOUS

PDF

76.0 KB Created: 2021-01-23 16:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5286089d8b92b901930bb1def9a8834a SHA-1: dec769beec14d9b3161080f4f57febaff0d77579 SHA-256: 09cb3b704c91a44ab618570d0fd40befd7ead7ce495c6fedbe900766924230ba
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=texas+mountains+and+basins+landforms PDF link annotation
    • https://site-1257504.mozfiles.com/files/1257504/xegud.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/2907202.pdfIn PDF document text
    • https://site-1177229.mozfiles.com/files/1177229/virufexolozes.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/breach_of_contract_complaint_florida.pdfIn PDF document text
    • https://site-1168173.mozfiles.com/files/1168173/leoncavallo_mattinata_sheet_music.pdfIn PDF document text
    • https://vogopulopom.weebly.com/uploads/1/3/1/3/131398589/vamomas_semubuz_kanobefex.pdfIn PDF document text
    • https://site-1195605.mozfiles.com/files/1195605/nsc_transfer_to_other_post_office_form.pdfIn PDF document text
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/lubumisogapudadagogu.pdfIn PDF document text
    • https://site-1180946.mozfiles.com/files/1180946/remoxedeviramomebipe.pdfIn PDF document text
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/610f23eab28ab2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foraxevub.rf.gd/xarufudogip.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/vikabunoxenufawezidabaja.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/acmarket_apk_pure.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/81862770641.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/28082139430.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/dls_2020_kits_barcelona.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/tet_2018_answer_key_junior.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/english_phrases_with_tamil_meaning.pdfIn PDF document text
    • http://pulilubanis.rf.gd/occupational_health_management.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/aarons_platform_beds.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/example_heuristic_evaluation_report.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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5208 bytes
SHA-256: 35f3d204cb6bca39bc5d4c3d3ed7001f41babc94a2e878efbe5dd2a1df4e4e43
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11100 bytes
SHA-256: 18034801ef7747233f9bf8a47010a0be7f82c2735d3dabaa685c8e9909121c70

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