Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c798fc8abc480c7…

MALICIOUS

PDF

92.3 KB Created: 2021-03-16 05:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3e83fabd37866033d378edc0c2a01293 SHA-1: 306859dfbc6cd5b9c1bd0578d1296fa03784c188 SHA-256: 5c798fc8abc480c7fcf95551384406772da4ff0d77958b3fa44fa75ccdd3a77d
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 threat. It contains an embedded URI pointing to 'resalured.ru', which is likely the primary malicious destination. The document's content, though obfuscated, suggests a lure related to a 'Sherlock Holmes movie worksheet'. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/123?utm_term=sherlock+holmes+movie+worksheet+pdf PDF link annotation
    • http://vapabamulu.22web.org/72695073905.pdfIn PDF document text
    • http://lovotilowojixo.iblogger.org/infective_endocarditis_guidelines_aha.pdfIn PDF document text
    • http://gevifavilovaz.22web.org/engagement_letter.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/e47f1dfb-30d3-4cd2-9e9a-968634a3af48/15671313988.pdfIn PDF document text
    • http://rozofamano.epizy.com/acids_and_bases_reading_comprehension_worksheets.pdfIn PDF document text
    • http://kavejanunar.epizy.com/achieve_ielts_test_3_listening_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d49737f-206e-477f-bd7a-d246b0a177b6/29413278063.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/cisco_ccnp_routing_exam_certification_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a19bd3-cb12-433a-b4d7-d95ba29207ee/30752638877.pdfIn PDF document text
    • http://goxesixenixi.rf.gd/dewupijibisagegomifopiz.pdfIn PDF document text
    • http://fexonawu.epizy.com/kenmore_elite_washer_will_not_drain_or_spin.pdfIn PDF document text
    • http://xulitapaxi.rf.gd/safety_not_guaranteed_movie_ending.pdfIn PDF document text
    • http://dupubavamuwoxaz.rf.gd/xewaduzivumumitijudofa.pdfIn PDF document text
    • http://dolipefutulej.epizy.com/pijanabupuw.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/blade_and_soul_revolution_english_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eade0c8c-9151-4288-b16b-bfc7178bfc43/zesusivisevalewakewalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8ff059-b767-4c22-89e6-d819884aad1d/36352895926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd7716d-f402-4221-a9e7-8f22f9bd528f/is_ipad_mini_5_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e65406-60e4-4a75-9486-a7ec33c3fdfc/tuzojefabaxamotarogagav.pdfIn PDF document text
    • http://povapetaranawo.rf.gd/why_would_my_transmission_fluid_be_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1c08c2-7b0a-4d0d-9419-363da0131e1e/wuwunigivolo.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/json_format_c_example.pdfIn PDF document text
    • http://nijozemujag.epizy.com/45338788814.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_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 5504 bytes
SHA-256: 893d6c5b303e81600c57455ebf1a05d670585558225706255c105953be56e7e9
font_01_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 10624 bytes
SHA-256: f874f67f002a0834128907e629205e6818bb9e07820b1754d6c70685f83022dc

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