Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d087bedcfd1e8c5…

MALICIOUS

PDF

88.8 KB Created: 2021-03-29 09:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 47ef89f325fc9d71a798de1d0fa139f8 SHA-1: c5b553395cd4b5e3e8e127d9a846f51b09dfee5f SHA-256: 8d087bedcfd1e8c5dd9c0c9d641b1d6e5ead243c7cec84f8213d4b20845b8ba6
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to potentially malicious domains, disguised as search results for 'amazing grace piano music pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

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://gimoguvi.ru/award?keyword=amazing+grace+piano+music+pdf PDF link annotation
    • http://aduo5.online/89113955238anrsz.pdfIn PDF document text
    • http://indonesia2health.online/25048747563cycd9.pdfIn PDF document text
    • http://ubzvp.com/duzukimdkez8.pdfIn PDF document text
    • http://tizakeguwowil.22web.org/jefodozojal.pdfIn PDF document text
    • http://sparzha.club/46950315761j4jjo.pdfIn PDF document text
    • http://xitigedomure.66ghz.com/25029760250.pdfIn PDF document text
    • http://natbeach.space/ruin_and_rising_quotesm4auc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_691a7e52d2e744ddb0722570590ea6f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/89444390189.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/6658797258.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/how_to_fill_presta_valve_with_schrader_pump.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/gu_idol_marksheet_2019.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_6525e73db780497fbe9a10cf077ffaec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c54495-763c-45b8-a1f1-2439ad1a01db/hayward_pool_heater_gas_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b13b847-798d-466f-b120-1c6cb54b6277/how_to_export_goodnotes_to_pc.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_d9969b7ef1824dae9d33e63eefb5889f.pdf?index=trueIn PDF document text
    • http://nafabumawo.rf.gd/angularjs_course_content.pdfIn PDF document text
    • http://roxegubipav.epizy.com/vagibim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 5484 bytes
SHA-256: 6569df56b0caefbabad4b71a7d34efaa2b57cd81e20672d44c65f2423b984cfa
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 11460 bytes
SHA-256: 8f439e322d55500c7b7a7402fb3458884f01fcfa1578e54bc0063b16ce19db32
font_02_sfnt_off000140c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C4 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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