Malicious PDF — malware analysis report

Static analysis result for SHA-256 396db23a95a77be6…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 23:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d3bf5584b14d9527f0c033e03e6c099e SHA-1: 25cadad34dadccbe50aa8f5401aba60a7a746b38 SHA-256: 396db23a95a77be6ec88665627c143eafe95205ce3979f5abe89d1e2357a4c6a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL designed to trick the user into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a school medical certificate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=formato+de+certificado+medico+escolar+imss PDF link annotation
    • https://cdn.sqhk.co/bidusowo/Rijajij/lynx_lake_campground_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/9sjdFru/xusemavikobudizosusek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_602de68cd989d.pdfIn PDF document text
    • http://xujavimok.22web.org/tumosado.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/2016_jeep_wrangler_service_manual.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/tarosutanejijexasabaw.pdfIn PDF document text
    • http://center-san.ru/rifodavovo67r6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_604779be59fcc.pdfIn PDF document text
    • http://xobaxibudizoba.22web.org/pdf_agama_kristen_kelas_12.pdfIn PDF document text
    • http://sikomugibepov.22web.org/distress_tolerance_handouts.pdfIn PDF document text
    • http://iranianvc.com/993209162504z3qi.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/gugoj.pdfIn PDF document text
    • http://ravinugamajako.iblogger.org/identifying_descriptive_language_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5fcaa7689fffb.pdfIn 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://s3.amazonaws.com/pibajuwi/35401060881.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/aged_pension_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/tuzake.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/best_android_video_app.pdfIn PDF document text
    • http://nodimetonakijeb.epizy.com/cdc_vaccine_information_sheet_varicella.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/innocent_defendant_english_subtitle.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 4804 bytes
SHA-256: ecb8dbaced7cd1bbb6142af9407beb1255442450d75c8fd0f74abf1551969bf7
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 11432 bytes
SHA-256: 1fd19ccd90736f0c2f533627c97d5d018df5d57e573b599d27870289c146e4f2
font_02_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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