Malicious PDF — malware analysis report

Static analysis result for SHA-256 944e686e6f3cc3cb…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 23:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 02da232e69f102bc20591b8ac0599f81 SHA-1: 3dd9bed2b9482b222e542e319cc347b38dca78fe SHA-256: 944e686e6f3cc3cb445b2a1f03a43d73d0866646ffdc5af3259b85b5a859481e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged this PDF with high confidence. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious link as a document related to a 'Bristol stool chart'. No scripts were extracted, but the presence of a malicious URL indicates the document's primary purpose is to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/award?keyword=bristol+stool+chart+pdf In PDF document text
    • http://rodina38.ru/zisesisomox4bqt.pdfIn PDF document text
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/9928042.pdfIn PDF document text
    • http://card2card-perevod24.site/ketone_body_formation_and_utilization_ppt7et52.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/capitalism_worksheet.pdfIn PDF document text
    • http://sallles.ru/loraff56up.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/jubugedixepimal.pdfIn PDF document text
    • https://donoreto.weebly.com/uploads/1/3/0/9/130969624/xarutimeduxawomiz.pdfIn PDF document text
    • http://covid-19online.site/chapters_interactive_stories_unlimited_diamonds_apkfhv7n.pdfIn PDF document text
    • http://usmileofficial.site/91245167828llk7f.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/wisuxo.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/beginner_english_grammar_book.pdfIn PDF document text
    • http://vashobereg.com/spell_druid_guide_ashes_of_outlandqmp3h.pdfIn PDF document text
    • http://haifaiv.ru/mogumoniradixono7bo12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiditad.rf.gd/telirufukix.pdfIn PDF document text
    • http://rojiferavu.epizy.com/zafusivubanile.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/mike_the_pillow_man_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/clearance_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/athens_voice_city_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/lagu_back_number_mabataki_cover_harutya.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/xitagelewojevemib.pdfIn PDF document text
    • http://buzekarutazobe.rf.gd/fatca_and_crs_reporting_deadlines_2019_uk.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/glitter_wallpaper_free_for_mobile.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5292 bytes
SHA-256: 7ca10b0f5138e251010b3237bd2c57e7893280b1f6aff64a049c84be7eaa3b86
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10792 bytes
SHA-256: e97079b8301911ea3141aa7fa86e8b2f79fcbffafd6e962af10f098b40b8cd23

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