Malicious PDF — malware analysis report

Static analysis result for SHA-256 b546fbc9806d99b0…

MALICIOUS

PDF

75.9 KB Created: 2021-03-15 16:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f623ba2d59153f7d2976a9e405c1c29 SHA-1: a4679c78be138063f492601885dd0e5ff45ff381 SHA-256: b546fbc9806d99b06e483dff4d36934ab625ca1f5620a113e266aaaa78924ce6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://resalured.ru/award?keyword=auditing+and+assurance+notes+pdf'. This heuristic, combined with the ML classifier and ClamAV detection, strongly indicates a malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=auditing+and+assurance+notes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5ff1b24e38f52.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/geQhgid/96088927867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5fe0b7430da7d.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/PhfQuww/world_chat_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444358/normal_5fe5494a98f6f.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/jbHTm09/take_off_flight_simulator.pdfIn PDF document text
    • http://theandyhong.com/excited_electrons_lab_answershhgl7.pdfIn PDF document text
    • http://m-ryanaf.site/noches_de_pesadilla_antologia_de_cuentos_de_terror4brix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_60261e8a4b51b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5fe0450964f31.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/XFeZijb/92379070576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5ffaf03177b14.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/kedowepukotetetp70x7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_5fdebff6c4bd3.pdfIn PDF document text
    • http://copyright-services-us.com/which_english_accent_is_most_attractivedvhq6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_5fdb5f82bea3f.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/e52c466d-be50-4f3c-af10-c618931eb68c/46734309448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0a6e8c-1e49-4292-b682-5c854cffeab3/jevulogutitur.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_71cf734b9af54572b5ac9610a91c7780.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_ae9cda52bc8f41c18a733f5e81880ca5.pdf?index=trueIn 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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 5280 bytes
SHA-256: 4c108ab0219e9ff6e5895cfae3b6fe2f5bcd0a7b7dff8d86c21d7f3f1657aeea
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10388 bytes
SHA-256: b93a19259c238516929814ef430ae204ee0e975c81fe3e5e5f7335edf3ae8cd5

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