Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00bff21e47ea553…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 15:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 155482b1cad559105676925157d8ad76 SHA-1: 472f644f867b7e874eeeac684a41b88b6960e616 SHA-256: f00bff21e47ea553aac7d959f52934ce912ad3b3b69f32254f9b65877f731d1a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with a primary focus on directing users to 'seumenha.ru' under the guise of a search result. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by leading them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/award?keyword=where+does+chemosynthesis+get+its+energy+from PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480758/normal_5ff2584bb0715.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/autor_del_libro_curso_de_milagros.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/85728481578ruq3z.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/renavimulidomefisevijavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5fd72588d4187.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/mezibimivir.pdfIn PDF document text
    • http://idealica-italiauficiale.website/40655486920m8i61.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/military_course_codeag9pu.pdfIn PDF document text
    • http://fionainthefield.org/wijumakamunagonaseya3gi.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/jajuzasalikirut/50151479834.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/79456517851.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/79257758365.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/97005107681.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/52127474715.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/91666698518.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_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5308 bytes
SHA-256: 91c2e30b1d662045e59c21ea676618c20166f4ff438a9381881aee31b7d654be
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10144 bytes
SHA-256: d5d804699051d1873ba6ce721ce71f3b0ed36d5de620aebfd183f748ba370a72

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