Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcb966a92de07f5…

MALICIOUS

PDF

86.8 KB Created: 2021-03-03 15:24:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 01f57664d9acd3fada4459e962b743ab SHA-1: 3def6e37413b863d74d029517581a5428a9a6f91 SHA-256: 9fcb966a92de07f50827704e98b6e974c2af77915bc2b07e22782ff059af145f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=lyrics+brave+heart+digimon'. ML classification and ClamAV also flagged this file as malicious. The embedded content appears to be obfuscated, but the primary function is to redirect the user to a potentially malicious URL, likely for phishing or malware distribution.

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://yafferge.ru/wix?keyword=lyrics+brave+heart+digimon In PDF document text
    • http://natlab.ru/les_bonnes_pratiques_de_fabrication_dans_l_industrie_pharmaceutiquehgmm6.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/the_giver_chapter_21-23_questions_and_answersnzfnk.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/bill_of_exchange_or_promissory_note_meaning.pdfIn PDF document text
    • http://legalvictory.group/100_veces_pappou733s.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/calendario_escolar_2019_y_2020_sep_cdmx_para_imprimir.pdfIn PDF document text
    • http://ru-payment.casa/godwin_nfl_injury_reporteucyw.pdfIn PDF document text
    • http://afracheat2.xyz/xegilevb7h3.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/nujotak.pdfIn PDF document text
    • http://bellissimo.online/kimariwilsvmpj.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/vubawipumufufamud.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/fulosobezur/cloudformation_output_s3_bucket_name.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/history_timeline_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/70771347748.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/71048458133.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/detenamapupuwefadiwovoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/cartoon_christmas_flute_sheet_music.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013455.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13455 17324 bytes
SHA-256: f2bece272fe5621de887e6009709070af5a28bb0146a9beaf091e1adba4031c1
font_00_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 4004 bytes
SHA-256: 53f1cc5a3f07b35ffde7a9633774d931d70f97f113acc9705789dd008f5567e6
font_01_sfnt_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 5564 bytes
SHA-256: 7d1d7e965b7574f160b88151f7389b093f03ebd37f1fe175fbc62a3a79379e9e
font_02_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 11096 bytes
SHA-256: 39e9d9f4d44c9e1cc16157fd5de2f45298e4fa6dbbf662dc6f37cf6227275a72

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