Malicious PDF — malware analysis report

Static analysis result for SHA-256 18132bfc50229f52…

MALICIOUS

PDF

93.1 KB Created: 2021-04-16 10:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6aadedab3adcc8c4bc981a456320c412 SHA-1: 23795cf1ec42bb1569b7a93734dece33d962eba5 SHA-256: 18132bfc50229f522d239a01720295ea576d78bfdb388ba4aeb669f42d77005a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure. The embedded URL `https://jacksth.ru/strik?utm_term=ncert+solutions+class+11+physics+chapter+7+study+rankers` likely leads to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=ncert+solutions+class+11+physics+chapter+7+study+rankers PDF link annotation
    • http://mists.space/limurofuvetizatiwdd0.pdfIn PDF document text
    • http://itfamily.pro/18088982032ju932.pdfIn PDF document text
    • http://meetsalle.xyz/sujil9g4hq.pdfIn PDF document text
    • http://organic-ita.space/malvino_electronic_principlesj2ly0.pdfIn PDF document text
    • http://tacfitproducts.com/arma_3_fallujah_map98kn5.pdfIn PDF document text
    • http://shtancircul.site/shareholder_activism_20180wab5.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/blue_jackets_playoff_tv_schedule4mogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/bepuponunexeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823be086-de67-4602-aa77-051522c2e7fe/phonics_workbook_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/pefaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/how_to_read_mm_on_a_ruler.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/libros_de_a._b._simpson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e42b954-21d9-4e14-a4ac-c7b1513ceaa3/27744318982.pdfIn PDF document text
    • http://pasexojubil.epizy.com/deviation_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/apricorn_drivewire_software.pdfIn PDF document text
    • http://waxobib.rf.gd/bticino_living_now_listino.pdfIn PDF document text
    • http://lalepimesizi.epizy.com/42497696821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b34ddf-a626-4d1a-aa7e-fbabaaef0674/quantos_tipos_de_grupos_sociais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99315b07-4e38-4870-bdb5-a0572b342b9d/stihl_fs_56_rc_mowing_head_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/olympus_om_1_lens_hood.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/vagot.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 5428 bytes
SHA-256: 47f5046e19a093c7b1c0666f811981fa2f3eda2c8ef7396ecb357f70bcf8d4dd
font_01_sfnt_off00013180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13180 11020 bytes
SHA-256: 18f49ebd4c6cefd71928b487a578b5da478208d2cbf5c27bb310b2fc1c60d3c4
font_02_sfnt_off000156ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EF 4024 bytes
SHA-256: 5f6fe9ac3b6fa6dd19550799013cd33c626e899904a45566e293e9601e2ee6af

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