Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f61d2859600f0c…

MALICIOUS

PDF

72.6 KB Created: 2021-03-03 01:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8df776236227bff814784d9fcfb63f36 SHA-1: 4c60db2df05496a2bfe0a50126d607a70af15199 SHA-256: b7f61d2859600f0c9bcd26753f233e75c1fd78f0a34f7d3baccd244b44f4ff87
94 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/award?keyword=how+long+to+bake+chicken+in+corningware'. This indicates an attempt to direct the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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/award?keyword=how+long+to+bake+chicken+in+corningware In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_601b5cedaee38.pdfIn PDF document text
    • http://instapodarok365.site/24592614759dwfai.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/LjjhhpJ/toss_em_all_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/ghifhda/log_thrower_mod_apk_an1.pdfIn PDF document text
    • http://sberbank.services/879479620513i70q.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/vatakefojunib/autumn_leaves_piano_sheet_music_g_minor.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/51264904015.pdfIn PDF document text
    • http://kikujebi.epizy.com/gojuxadijitaxujatedagi.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/cursive_practice_sheets_for_3rd_grade.pdfIn PDF document text
    • http://dodixuvizovov.epizy.com/59942806337.pdfIn PDF document text
    • http://sufelubunat.epizy.com/chevrolet_trax_2018_user_manual.pdfIn PDF document text
    • http://sobenikirija.rf.gd/conclusion_for_hotel_internship_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/bopabexopejoduribi.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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 5140 bytes
SHA-256: 26d23add3f7bcb09fb58ecc7d1f89016db6f1034c4d64b55d52d0cacd5612f76
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10240 bytes
SHA-256: df2c9705304eee2085c2965eac0273a5b20c1284f39c96b2356eea5fb2662260