Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6578f4bf11bf16…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 21:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7506bd46b8546fd5f49bd903f4ecf2e0 SHA-1: 189834f5e5a2d57ffaf6d78791f570ef9506d511 SHA-256: fa6578f4bf11bf1647efacbd666b97bc003eed79ca2da356c43d2e1f68d7bb51
156 Risk Score

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 a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://jacksth.ru/strik?utm_term=winning+ugly+book+pdf PDF link annotation
    • https://cdn.sqhk.co/dawadetugas/ieOha4P/50581317552.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/sigarosasuxowoligu.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/bsc_biotechnology_subjects.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/ijccRIW/gedodagetuled.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/kukukojuxabonaremivis.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/47502622763.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/89401167795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://111f14d1-127c-4f82-b5db-4f039c0c329c.filesusr.com/ugd/299074_d29897d7f2b3496bba209ef7ffad9fbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/oklahoma_cdl_hazmat_practice_test.pdfIn PDF document text
    • http://xojamaziger.epizy.com/kptcl_recruitment_2020_notification_download.pdfIn PDF document text
    • http://pinezininefos.epizy.com/support_vector_machine_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/mexepa.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/watubemogojajepetefajedip.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/can_i_annotate_in_ibooks.pdfIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_d167818916c146f8b1486fc621b1f3fa.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_ec28b03108904e1d9483f65c3f542704.pdf?index=trueIn PDF document text
    • http://kovawasokagi.epizy.com/descargar_caballo_de_troya_9_mega.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_c2a81ae6fc97400398a601a19d710f36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/maplestory_come_find_me_cheat_sheet.pdfIn PDF document text
    • http://mewabetowa.myartsonline.com/anatomie_radiologique_de_l_abdomen.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/sutid.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_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 5044 bytes
SHA-256: 92142fd2c539d39b6786d8ea0ae8c2b36e9ca9ca5bad51dc93bda3e04c57dad1
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10696 bytes
SHA-256: cea2679ccc70ee9e5439f08e0ddff53f2f6bef42b30c815b7f7605ef2d11eb6a

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