Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b311b8d99815e9…

MALICIOUS

PDF

69.3 KB Created: 2021-03-09 21:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b79e35dc7496d5391a0755da5d764495 SHA-1: 9498dc687f58be826609dffba9be0c7f67e677a6 SHA-256: 13b311b8d99815e9583fd2255ba6a62ec6f2aede1084fe9ae386a8ccde3c1178
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'jacksth.ru', which is flagged by heuristics as an external URI and part of the malicious content. ClamAV detection and ML classification strongly indicate maliciousness, specifically identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

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://jacksth.ru/wix?keyword=tt12-1100+texture+terminator+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5fc5a34425106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470035/normal_6000b226205d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_60128a9dcaeb3.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/cidTVij/92508605817.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/75bZjcj/appreciation_event_invitation_template.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/97986343707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_60220d8a208be.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/pgdieja/2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408976/normal_5fc660a540a52.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/hp_elitebook_folio_9480m_audio_driver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530070/normal_5fecbd8b477e6.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/ihU8RK2/today_s_news_headlines_usa.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/jebokizez/o_liberalismo_poltico.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/pirivadijejidal.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/woodworking_joints_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/android_application_pending.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/world_population_data_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/98815180576.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/murujag.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/10882015216.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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 5288 bytes
SHA-256: a6eb3b5b512abe3b7e5ee28b3f2777caffba02d99e4faf104140f4e8661ad446
font_01_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 10036 bytes
SHA-256: d1ad1d7b5c464bea9d7ce589cd86eee79626e3e582961d9395292741140bf3c0

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