Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e5fa253426839c…

MALICIOUS

PDF

72.6 KB Created: 2021-03-06 03:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f24d38973889b03549058fa617e0240f SHA-1: 8260013b64aa13bb0f8a0326528733477a19cf64 SHA-256: c9e5fa253426839c96c7db7be6e9482745e5b7d8b467417783d47d0a01e4133d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs, 'https://zajinet.ru/award?keyword=harry+potter+half+blood+prince+chapter+14', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV detection further support the malicious nature of this PDF, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=harry+potter+half+blood+prince+chapter+14 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483856/normal_602d4096ac164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe13c4e15891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_602e5a0f41a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_5fd666730e67a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5ffc638b30b4f.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/47fcaf14-179f-4f2c-920b-c38506a39f63/74401481145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8bc515-b8bc-4d30-8e27-0b8d561cf3ef/89443458385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfc1ef1-6548-48aa-8c54-9c373414d092/11031338849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f4af4c-84a9-4517-bdb0-7f14f833abbf/monufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcebd85-090e-4034-8602-ea133a84fe0a/22814767292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839e7329-1aa9-4ba9-bf46-ee878c57b1df/nepekironefiruxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df03fa19-93bb-4357-8f9a-87e9f388f76c/jokozerakuzozolaxonip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee011f24-0b53-4b93-9f69-8caf195ae9db/68519587845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36f7a26-0c70-4169-bf76-d46648a54bee/music_notes_names_and_symbols_and_beats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c587addb-22a3-46ba-a6ab-f2684b96169d/game_of_thrones_telltale_download_for_android.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_9b868e3ceaa04db6a94306c06b0fc981.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b067e513-495e-4130-822d-48096b5a5858/the_aeneid_summary_book_4.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_48059b1001ad46128ce25f6dbfa9bbe2.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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 5408 bytes
SHA-256: ab33f2cd24a52aa321dc7dfc879bccbd8b2448ebdfeb51a3897e17ed71a4bb0d
font_01_sfnt_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 10124 bytes
SHA-256: 82bfc1675aea7500c1d540e710bc353c79850e48b47bf488935d0a5630be9118

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