Malicious PDF — malware analysis report

Static analysis result for SHA-256 a804482ea883253d…

MALICIOUS

PDF

76.8 KB Created: 2021-02-27 16:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 113886960f6df8954cdfb73e7ead58c3 SHA-1: 2a949530896e11a7b7255dbd60c9e018e2cd5ce4 SHA-256: a804482ea883253d22498f304e3791b316bb7a3982fd0e5417f03a82fafdb51e
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://crophysi.ru/award?keyword=los+mejores+cursos+de+ingles+gratis+por+internet'. This URL is presented in a context that appears to be a lure for English courses, suggesting a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/award?keyword=los+mejores+cursos+de+ingles+gratis+por+internet In PDF document text
    • http://clobuss.ru/debt_recovery_letter_template_ukp3mog.pdfIn PDF document text
    • http://onenature.space/best_maths_book_for_class_6_cbseoteke.pdfIn PDF document text
    • http://netewe8.xyz/browser_fps_games_nozhymc.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/tosevud/crystal_reports_2011_for_sage.pdfIn PDF document text
    • http://sofopemesojume.epizy.com/60413990577.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/economist_intelligence_unit_democracy_index_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/81715107804.pdfIn PDF document text
    • http://bowuxok.epizy.com/bittoo_boss_full_movie_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/ckd_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/wawidisunidubuxigovorejep.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/supertraining_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/siwodezitegilasoge.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/philips_avent_3-in-1_electric_steam_sterilizer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/wavolatasimepodulosineme.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/xijof.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/acc_aha_stroke_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/phonics_workbook_1.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 5412 bytes
SHA-256: e5be2675bbc04aa5f5c41e6730d0d3930ddf66ca59f8400c3f006e3eb27bbca5
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 12588 bytes
SHA-256: 84dd0749ddc546d41b5f37b9b5f5005c73a1eae1c6c8dfc04031db0195188b81