Malicious PDF — malware analysis report

Static analysis result for SHA-256 59583912a1df8c95…

MALICIOUS

PDF

66.5 KB Created: 2020-12-23 16:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e123d02c6d034a9564ca822e96db569 SHA-1: 6d71f4b7e3a1c9ef8bf7da0592baea1f96de016d SHA-256: 59583912a1df8c95232fe1b8da6c4a1a77dcfeb347dc4eb1cc81a159b61d0312
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 0.9996

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://trafficel.ru/aws?utm_term=accelerated+reader+answers+for+books PDF link annotation
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/wefoli.pdfIn PDF document text
    • https://pupuzufasu.weebly.com/uploads/1/3/4/7/134759867/wexafaripu_nawid.pdfIn PDF document text
    • https://sagoxanoku.weebly.com/uploads/1/3/4/3/134350044/tanokodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fa08ed7c81b7.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/mejigavukolu/anosmia_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/limpeza_21_dias_arcanjo_miguel.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/rukelisawewo.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/tisifemimenadogukudati.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/91060709006.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/26376086830.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_off0000c78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 5300 bytes
SHA-256: aea26440ff5c96296b7a3ac8ab70011a61c7632ce90f95255d7a183cb2362b6c
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 10408 bytes
SHA-256: ff49761dc3d64af8a98248e64f2b7fe03dc6eabfe11b6d8e5faf8226770235ad