Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4501d0fd9b09ac…

MALICIOUS

PDF

72.3 KB Created: 2021-02-10 13:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3c00bc802bee4ee8d810b6d492e0c451 SHA-1: e8fdd34fb810365bc2e4bd957aaceacb8510d10f SHA-256: 8f4501d0fd9b09acf000aa5c4c862dd97bd1a4288e76e34c002389e3275b45da
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 0.9998

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://leonvi.ru/123?utm_term=bible+spelling+bee+word+list PDF link annotation
    • http://ponoxavar.iblogger.org/xavogivotumumaworofekim.pdfIn PDF document text
    • http://chelamela.org/10942015094zuaew.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/lubigupadu_jugunemum.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/gn3sifm/bee-_bot_app_free_download.pdfIn PDF document text
    • http://lidzadva.xyz/dasipaldesng.pdfIn PDF document text
    • http://onesmall.space/dibujo_tecnico_bachillerato52v5p.pdfIn PDF document text
    • http://freedate18.xyz/whisker_city_pet_fountainkec0d.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/gjcQgjs/63961721561.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/belapawerezuju/burke-_litwin_model_of_organizational_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/pegezegezuwotufugiketeve.pdfIn PDF document text
    • http://xizoxenefodage.epizy.com/arlanda_express_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/nofitagositil.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/nopapixuwitox.pdfIn PDF document text
    • http://nerusejide.rf.gd/22974277558.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/buwifozeterenamekaledi.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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5200 bytes
SHA-256: e83f7cbba05d99e90c8ac74f5e88712dd844d03bb08960523618b6358990a038
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10456 bytes
SHA-256: 78ef8112541660258565da83b05a8f29b37dc53c38eba70f8d4824a88d4b712e

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