Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a4f0360d35cf15…

MALICIOUS

PDF

79.2 KB Created: 2021-04-05 01:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1a5632a8da36b7c710978dc09aa30edd SHA-1: 1cba4b39b1881ada6bbeffe176db97808079cecd SHA-256: 20a4f0360d35cf150e4af0a6a7c34355ff4f632453e204424ae5a66d9405b2ed
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to 'https://zajinet.ru/award?keyword=asterix+and+the+chariot+race+pdf'. This URL, combined with the PDF's structure and ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malicious redirection attempt. The presence of embedded URLs and a high ML classifier score further support this assessment.

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=asterix+and+the+chariot+race+pdf PDF link annotation
    • http://chatik85939775.fun/lego_millennium_falcon_2017hhrxh.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ghcouxu/never_have_i_ever_list_college.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/ZAaigjh/unconformity_in_geology.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/jap2FQr/e_gregory_wells_views.pdfIn PDF document text
    • http://teksalle.xyz/7067024768077ira.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/zafijukopa/sugonoxejagevakamakeluwi.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/velineon_vxl-3s_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/ulysses_by_alfred_lord_tennyson_analysis_line_by_line.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/convince_me_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/identifying_tenths_and_hundredths_worksheets.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_9b9ac7cab64a402aa8504ce143849b16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8d1f7a-dbd1-462c-a731-ecbc451ebc3b/91343892643.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/how_to_factory_reset_dlink_dap_1520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ee8f5e-5f8b-4d77-8d46-9fddb8afc458/panasonic_microwave_oven_grill_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/rejatiduzim.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_ebdaf651b96a44d3aa715e9dcef763e2.pdf?index=trueIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_5b6e3b87b72c43659deaa05a0c413b99.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_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 5268 bytes
SHA-256: f6750a1ec77dab7876eaf046ddc32f524c127f51bd7a21ac5a7a8dcb57975529
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10984 bytes
SHA-256: 10a269dc868f6058d53aec701996e156f56fa191880b16f23fb053c968fecfe8

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