Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8fac94ead18c83…

MALICIOUS

PDF

73.9 KB Created: 2021-01-23 19:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7441cec145559281332a767da6026628 SHA-1: eba11a3d9bd7e5b8c9465161e8c729b399e82317 SHA-256: 9c8fac94ead18c833a6d8676c55f1a5d17d76cb6d09120093fd03eabeeb1af8b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a lure.

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://maypoin.ru/123?utm_term=shelby+county+clerk+texas PDF link annotation
    • https://site-1166687.mozfiles.com/files/1166687/forgotten_synonyms_dictionary.pdfIn PDF document text
    • https://site-1178831.mozfiles.com/files/1178831/cartoon_defense_4_mod.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/e6ff139a5c2.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/secret_life_of_walter_mitty.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/residential_aged_care_guidelines.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/nizonesun.pdfIn PDF document text
    • https://site-1166608.mozfiles.com/files/1166608/dosolarumovem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5fcd7c7624fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5fd79b2456353.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/metubevozisul/modern_chronological_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/vobarikapozomututasexe.pdfIn PDF document text
    • http://surifetopene.epizy.com/golaxalum.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/xazokodapuremafijipef.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5364 bytes
SHA-256: 4000a8443afada9d887ed06e87852a4bc5678b50436ba2c8824039a5ead4532a
font_01_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 10732 bytes
SHA-256: c63b96434127a61fad557e203b77b87374ebfacb500263fc0f6f06581eb029ed

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