Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c57660c3323a0c…

MALICIOUS

PDF

63.4 KB Created: 2021-01-06 09:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 314fc284860e500c3bfdeecfea4dc348 SHA-1: 2ba6e92a59453bd9b4ec1ddcd12e354621236134 SHA-256: 90c57660c3323a0c02ac871d7dee8a9db4dee2fab8298b4cf2ef03f0864df0f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'trafffe.ru', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure designed to redirect users to a compromised or malicious site.

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
  • 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://trafffe.ru/aws?utm_term=linear+function+and+slope+intercept+form+worksheet PDF link annotation
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/7414627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455672/normal_5fa8d1d4291e6.pdfIn PDF document text
    • https://bogezemobazuv.weebly.com/uploads/1/3/1/8/131856224/vovagaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380230/normal_5ff502e548924.pdfIn PDF document text
    • https://cdn.sqhk.co/mekizojo/Vdw5xDW/87746308573.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/rusimubipulu.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/pewipun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8e07505-0922-42cc-bf40-80f2c11ae732/zemikaxiget.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/heart_sounds_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/way_down_we_go_song_musicpleer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a094f6a0-0ae6-4f68-a4b4-2151fc59dc3d/western_arkansas_counseling_guidance_center.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/film_camelia_rhoma_irama.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/astrology_books_free_download.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_off0000be9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9E 5492 bytes
SHA-256: 66392d027b7bd85554e4c656240bced1d698d5465513cd47911ac3fb7c55fdf7
font_01_sfnt_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 9288 bytes
SHA-256: 8ffc87cef41c26fc351cc7942c961b34d3f777fdcd97535639e87ba384fbd440

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