Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655cdb6e8a01081…

MALICIOUS

PDF

77.1 KB Created: 2021-02-25 06:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 808c1e747bb96b0a640723e006c07a1d SHA-1: 6e5423e1f46e23dde81fce74ce6bf4ea113dbbbd SHA-256: 9655cdb6e8a010814489c31bfbf879612948a6edac7ab561213ec29a75615579
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

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://seumenha.ru/wb?keyword=will%20there%20be%20a%20captain%20underpants%20movie%20sequel PDF link annotation
    • https://cdn.sqhk.co/lepavenujal/fqP7CvC/hd_movies_free_download_site_bollywood.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5ff7628a461b8.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/repesosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_6009247444ac3.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/69693220084.pdfIn PDF document text
    • https://cdn.sqhk.co/topefebi/ghchap9/20130252356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6037210190ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60362a54834e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namepafubi.atwebpages.com/vermont_service_center_email_address.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/yom_kippur_prayers_reform_judaism.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/hollywood_the_dream_factory_an_anthropologist_looks_at_the_movie-makers.pdfIn PDF document text
    • http://wenares.myartsonline.com/engineering_software_as_a_service_an_agile_approach.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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 5652 bytes
SHA-256: 563e0e8812d77e331d27fb672429a52c2c2f76aa461728380d738f20cd84aedb
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10880 bytes
SHA-256: 8a7ef6830a7444fdfcf97ecd2eb11873b1238003b998beac8856559ad09692b9

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