Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdfa6837d26c539…

MALICIOUS

PDF

69.0 KB Created: 2020-11-26 01:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1a5e767089e2c391ff22110207bbf6d7 SHA-1: 79701eb9366a353580081e1c28e2a4b00e586c6d SHA-256: ecdfa6837d26c5393656918fcd5740fb70666e42df09fe88c8e4a90596bbf058
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to SEO-optimized content, suggesting a link farm or phishing attempt. One prominent URL, 'https://traffnew.ru/strik?utm_term=eagle+pass+junior+high+school+phone+number', is directly embedded and appears to be the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=eagle+pass+junior+high+school+phone+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421780/normal_5f9cfb0e4175f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_5f9f5ccdeec2d.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/mubulelosaf.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/f845f68c59fd860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_5f9eb63b5f9e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57adb70-a546-466c-b9c8-ebb4a3838349/49486650218.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/different_types_of_analytical_balance.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/pranks_to_do_on_my_boyfriend_over_the_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/68337227765.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/excel_pilot_logbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/binomokalasutikepoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc64f336-c82e-4260-8ab3-eb4973a42c83/don_quixote_hall.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/history_of_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d49d81-b374-4730-ada3-adafc0f51391/57809496445.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_off0000d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 5520 bytes
SHA-256: b4765ccb20c6a1cadcab40c5a64588bcae6894890503a9031a14288fb12d536e
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10524 bytes
SHA-256: 3cfcb6a863b76879bbb1af4d4bc26f87f69e1cfc1c81554e10b23625abbcf47c

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