Malicious PDF — malware analysis report

Static analysis result for SHA-256 234f4aaa16ab06d1…

MALICIOUS

PDF

177.8 KB Created: 2021-05-22 07:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26fc725489f1bc5bc5944ca4805a105f SHA-1: 30fd0e4ee65614ddaf1349a68804a6801156aa25 SHA-256: 234f4aaa16ab06d119e6c74e71e924df7146ecaa6c1fed3a1a29828e86e46b34
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains an embedded URL pointing to 'pelibifir.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to physics exercises.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pelibifir.ru/strik?utm_term=ejercicios+resueltos+de+fisicoqu%25C3%25ADmica+gases+ideales+y+reales+pdf PDF link annotation
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/dee2bd8fc6a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_603ff6e2245fa.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/1375539.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/f291bc7c4d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_606e8f07e0dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_606e14fb5c534.pdfIn PDF document text
    • https://libexezelidod.weebly.com/uploads/1/3/1/4/131454359/venepu.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/adeee96d-6e08-41b8-b531-4c920b1b0c77/dometic_rm2652_control_board.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/grattan_institute_report_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/how_to_fix_oil_filled_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/burid.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/tatavimegepexinasubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3718c2eb-db41-47c7-aab3-17bded0fd541/amazon_uk_casio_g_shock_watches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc1f58e-c835-4d7e-b11c-7350d308b6da/how_to_learn_self_discipline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20b6c6a-edd0-4cbe-95e7-b59ddc7e08b8/61137334130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35511715-7689-4e33-91ba-8c5701e49892/how_do_i_write_a_biography_about_myself_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/fugaxaweraxivegabinij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b0989c-5aa5-48b5-8214-03ea654db345/30418747950.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000245ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245EE 13008 bytes
SHA-256: 9f723e0099d0e7d0ef448e402e3c0c83d346646ddeb2f4debeebb4d814ae424c
font_01_sfnt_off000268f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268F7 5568 bytes
SHA-256: 5f404e36c0d446aa897d81202b05439c53e7b25f768068380480ed8c90051fd7
font_02_sfnt_off00027bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27BF5 13304 bytes
SHA-256: 3a1f58565acc03bd73949d9bdb93bf33248a1ab1e802ad9145acf50436af915a
font_03_sfnt_off0002a76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A76F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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