Malicious PDF — malware analysis report

Static analysis result for SHA-256 340ed26a01618204…

MALICIOUS

PDF

80.7 KB Created: 2020-12-14 22:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 570c6531dc0baa5f42d443f0968628eb SHA-1: 1801327b4fab98d9204c4ea78c1cbef90e379cf7 SHA-256: 340ed26a0161820435239d674d0b5d1a49afd1caa802640207ca64b3bccf0680
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic identifying a redirector link to `https://cctraff.ru/123?utm_term=new+mexico+12th+grade+english+textbook`. Another critical heuristic indicates a PDF link farm, suggesting the document is designed to drive traffic to numerous external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=new+mexico+12th+grade+english+textbook In PDF document text
    • https://pigaxusimip.weebly.com/uploads/1/3/4/5/134584788/bojunike.pdfIn PDF document text
    • https://vapipokolodux.weebly.com/uploads/1/3/4/3/134307816/fopijetumigosab_nelawareda_susukonisakuron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f8c15d441eb2.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/5203447.pdfIn PDF document text
    • https://nulebudi.weebly.com/uploads/1/3/4/5/134593979/8529275.pdfIn PDF document text
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/2479cb9619d.pdfIn PDF document text
    • https://dapinolun.weebly.com/uploads/1/3/4/7/134762022/gifiti.pdfIn PDF document text
    • https://pebiname.weebly.com/uploads/1/3/1/4/131453048/9678010a7ec.pdfIn PDF document text
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/5097553.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/vuxalirudidel/lugow.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/free_printable_divider_tabs_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/dufasijibivole.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/furupuzogalamukasalezufil.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/wuzimasakobibazixagulub.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_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 5868 bytes
SHA-256: 20eb1840e9e00a5870089227489f7c8742a6e3d481e3793f8c1fd67ea1dc1a6b
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 10704 bytes
SHA-256: 7af81ca727e0f8191e39bc900c493d05615bd13345dd14e43447c9f829e3c8f2

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