Malicious PDF — malware analysis report

Static analysis result for SHA-256 559b11b929933b34…

MALICIOUS

PDF

75.0 KB Created: 2021-05-25 03:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ffd5d9ff98d3bcc1b41c1d9553444c00 SHA-1: 2493673179ee899f13d99a5f8f1fb200119e58b9 SHA-256: 559b11b929933b3495e44843c1786a3a0cc72e25ecafdff55183702787617f26
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of an external URI in a PDF, combined with the high confidence malicious verdict, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=physical+rehabilitation+o%2527sullivan+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417834/normal_601d5d24b3581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fce5cdc0c9ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_606ad006afa72.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/nafibanefexex/dulik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92fbd78-f53b-4bda-8cee-85852a9532e6/can_you_change_the_battery_in_a_nook_tablet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c5dd38-b4f4-41cc-836d-23694ad2cd86/is_sherlock_holmes_family_friendly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8574c924-f5f8-4d34-bd92-8f783baabc87/logitech_harmony_300_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/rakufasiv.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/low_cost_spay_and_neuter_near_me_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/zitofarukutudekusomojubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74492ecd-62a1-46a7-acf6-be165d5fdedc/ruzewaxen.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/1666923370.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/accelerated_math_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/demoravafesafosifek.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/atwood_furnace_parts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/section_19_firearms_act_1968_sentencing_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fd3126-3ff8-42ae-b00a-73af713fd48b/programa_de_estudios_2011_secundaria_espaol_segundo_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43925936-7b62-4c92-9f01-8b827820d2c3/42640353027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcee80ba-e538-40af-b7ca-9fa5f6635f79/kumojekenuwavekasoji.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/sharp_lc-24le175m_factory_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/26630609739.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5580 bytes
SHA-256: 0dbb776a87443900f60fac4e9f0132d9f6071b27e4236246fd2c4da8a5fb1a71
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 11112 bytes
SHA-256: c793aabaf164a1b8e20a873a09f8409030072cf17daceccbe4ea685384c8d5a9

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