Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d57c6d14d21d1c…

MALICIOUS

PDF

71.6 KB Created: 2021-02-15 01:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: caca09e77eba77c46916bb09f3f603de SHA-1: 9eded04f5685017c5dc1fb072464fc3106aa5717 SHA-256: b8d57c6d14d21d1c623d332c0c556f067cf7f24eb776e158ebe9434ae8f608dd
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a redirector link to 'https://yafferge.ru/wix?keyword=16.3+biology+workbook+answers+pdf'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=16.3+biology+workbook+answers+pdf In PDF document text
    • https://rulusekiraz.weebly.com/uploads/1/3/5/3/135322703/5acb92549d7.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/9729839.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/mipuxif.pdfIn PDF document text
    • http://sanasojan.22web.org/breakneck_mod_apk_data.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/6998956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwuwusa.epizy.com/friends_with_benefits_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/34499883305.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/adhurs_telugu_video_songs_mp4_s.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/ritomuxotenuguroxuvom.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/ratixetogilufitulafoxize.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/61999861592.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/change_default_template_powerpoint_2016_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/achtung_die_kurve_dos.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/punumufovas.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/identifying_theme_4th_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/angry_birds_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/subway_job_application_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/compare_2_excel_spreadsheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/altivar_610.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 5912 bytes
SHA-256: 0deaeae67b5a505708bc5f8a799cfc87b690c5dcf2e648f27f74a576bfc71f5f
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10196 bytes
SHA-256: 049b81182d5603922d9420831685af5819f583aaf27056e4c43a2c0a5de47d11

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