Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25d5b65d218f52d…

MALICIOUS

PDF

78.3 KB Created: 2020-12-26 16:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 96011bf63ecaa50a9505f3d11abcdafc SHA-1: 78dce3191514b060839fd0c0bb6bc55c6651a31d SHA-256: f25d5b65d218f52d063bfd79e6cfa32208b11d94d78af9dc5d8d9230c2858215
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with a prominent one pointing to 'traffnew.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack involving a password-protected archive. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/strik?utm_term=romantic+ringtones+songs PDF link annotation
    • https://kenodajeto.weebly.com/uploads/1/3/4/4/134490943/wufinutiram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5fd612da3f127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fcac9abb3d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fe6f54898606.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/vetovam.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/2171885.pdfIn PDF document text
    • https://vowesajakekefi.weebly.com/uploads/1/3/4/5/134513426/vibilipolojuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fdff2726d074.pdfIn PDF document text
    • https://topurikilelugon.weebly.com/uploads/1/3/4/6/134611003/dozimupajav-fidubeni-ripobemowoz.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/henghuili-files2/31130949349.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/materiales_dentales_barcelo.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/autobuska_stanica_banja_luka_broj_telefona_informacije.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_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 5096 bytes
SHA-256: 7603823243d28ac417a2c65a70e64c138bba4be8469ccf77b7d590b4303c7698
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 10580 bytes
SHA-256: aea321d9c0ac1351b88e8c6d0d21ce02f85188fef820d9cf97115584c8fabc01

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