Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d68e0d4a1317dd…

MALICIOUS

PDF

70.5 KB Created: 2021-05-19 00:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ac8f96b83033ff669234a26b1befaad SHA-1: 99b366117261d250ca437173c779eb1cd83c81b6 SHA-256: 21d68e0d4a1317dd0d5c4a0a4f6b31c8d8bd0812fa6401eab56f30dc02052ee5
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=vocabulary+workshop+level+d+unit+1+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fe786328d262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498986/normal_60074e611834c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_605b72344544b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_602ea3a2eb725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_6029c3ee1ef0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_6060921597f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_6038545990294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5fe7c074c2536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_604ce3c428e18.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/nilititonawafim/death_of_a_salesman_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/client_quarterly_business_review_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b95f3bd-98f8-4069-b857-957bb97651dd/lufuzediv.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/vuxoxunarexodegirafo.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/vapidofavipizaviza.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/alesana_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7ee0d0-cc5e-4d2f-b8f7-ddef0ea17666/html_book_for_beginners_free_download.pdfIn PDF document text
    • http://teposekif.epizy.com/66395856814.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/admin_page_template_html_css.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832644b8-3e76-4873-96a1-113caf6174c9/81865198718.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/cafe_coffee_day_case_study.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 5716 bytes
SHA-256: 04620d5db12ab8336bc28428cf9ad7d1717d66aa6daa0433a9a67c4b537606ec
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 9368 bytes
SHA-256: 200c8a770c8a79a61c3e075790db8812e3d804fc4b2f9db45324149c50b5f5f1

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