Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c61baec30cd889…

MALICIOUS

PDF

84.3 KB Created: 2021-04-27 22:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b5f974d9acd01d449174befd74c43c5f SHA-1: 634ed49b2fd247918b4ec5063e3efbde78e6d758 SHA-256: c6c61baec30cd889f5827567567c62df3b7cb36d51d25dfde98c78faf76d1266
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, with a critical heuristic flagging it as a PDF link farm. One of the primary external links, https://jacksth.ru/strik?utm_term=up+from+slavery+chapter+12+summary, is likely the intended destination for the user, potentially leading to phishing content or further malware. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=up+from+slavery+chapter+12+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420915/normal_600d89937cdc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_6054f4ce8e505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_605b8d0101507.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/c5f9ddde-b400-4329-a388-24ab01229b49/what_dtr_in_crochet.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ct_cdl_self_certification_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a79e68-e5b3-47ff-a5f7-f99e8f4352f9/forofasezajoka.pdfIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_288f7d21fc814a7798cc8f4398f86e4d.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_a3bdb4276dcb49c99334adb32c36fbf1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5a16a5-411c-4b23-b040-a5871acf0bce/imagenes_del_sistema_endocrino_y_sus_partes_para_dibujar.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/lotuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/99757632504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1d5001-5bb5-4d28-98c1-814828fa627f/99401445372.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_255368a706b448a3bd188a3ca486c55c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/how_much_was_michael_jackson_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/english_worksheets_year_7_printable.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_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 5592 bytes
SHA-256: c0390b8cb6b907e3b52f8bca871efb7eb86a36943139113204fb1b2de0968ab8
font_01_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 11404 bytes
SHA-256: 565145f0767ef4b184717b6851a45b7b121ac82b86fff4117a215927f3127e35

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