Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373851abe1ef0df…

MALICIOUS

PDF

77.0 KB Created: 2021-02-21 10:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7703d21be681b499b5113f4d3c34da84 SHA-1: 466bfaf72167a33adf575d4f7962915cac857764 SHA-256: e373851abe1ef0df72c1f8ca75737543d3e8ebf121000ba61386d8e8d9e52720
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains references to 'Eberron calendar holidays' and is associated with a large number of external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

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 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://leonvi.ru/wix?keyword=eberron+calendar+holidays PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393638/normal_6027fc602dde7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449974/normal_5fe38f234e0b5.pdfIn PDF document text
    • http://getveran.site/bharatanatyam_adavus_with_music_freetd0jq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_602b664d0973e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5fe93474cd7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_60246a1d6e547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5fdd283773c89.pdfIn PDF document text
    • http://opsnatur.fun/josuvogapunizimirujuxl4xkr.pdfIn PDF document text
    • http://avto-document.site/karap7ital.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_600ca996081a4.pdfIn PDF document text
    • http://simultaneously.space/3745298166b7q3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_600d009d4dbf1.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/xasideferifawowok7pkh.pdfIn PDF document text
    • http://indital.fun/noluzofekawifepozitp1zx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_602c0e9cd83af.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/fuvidokibet/64471527382.pdfIn PDF document text
    • http://fabonek.rf.gd/xisezesaxuzabulivojog.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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 5224 bytes
SHA-256: 41f8bb31bba3b22789d79814b71041c90bc7992b4ac131a275c457dd091dbc04
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10760 bytes
SHA-256: df4f3e54a57b1aa00df1f6a5bdb1d4812508c12d212f389700c9f1fab89f6a1a

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