Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdcd15a184f2020…

MALICIOUS

PDF

66.1 KB Created: 2020-11-23 20:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 946dc10ed0d07a7de7698ca08dd2421e SHA-1: 1e325a37f69adc3b4cbde519dccb9d6246e5f08c SHA-256: 5fdcd15a184f2020d06eab6a13c10a3bf0f4f8339c50266533fe06276c8d144f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffi.ru/strik?utm_term=blogspot+pes+2013', is suspicious. Another heuristic indicates the document may be password-protected to bypass gateway scanning, suggesting a malicious payload delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffi.ru/strik?utm_term=blogspot+pes+2013 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fa2b041bd3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f9d317cf3273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5f93b40c5f300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f9cf8718fa28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5f8f6c79dafaa.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/0562a1cc14d5d7.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/juxafajud_narop_gebukigez_fapule.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/matogapibelifiv/69797032375.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/jovelalelapowe.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/fnb_field_harrisburg_address.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/orthodontic_store_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/candlestick_pin_bar_formations.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/93781181814.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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 5220 bytes
SHA-256: da5b052745696cfcba65fa8b144cc37585c686ad968ad15b3c6a96e25d47c8bc
font_01_sfnt_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 10940 bytes
SHA-256: 457d360b8e18f196dabd0d480c4ca42cb2453b82ab17d74af4e8d9b986d05902

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