Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ce78eaacf18c21…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 02:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0fe5ee593f1434d0716af3751d1b6ddd SHA-1: b831e9215ae083d9c0997a68eb149b6dd9ac5f84 SHA-256: a0ce78eaacf18c21059be3fb35b6f8661ab01ae741aed7d1f5dd0e795932edb6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational materials, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/123?utm_term=solving+quadratic+equations+by+factoring+answers+pdf PDF link annotation
    • http://ifeelgood.club/elements_of_programming_interviews3A_the_insiders_guideqm00v.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/geSEihi/10824310547.pdfIn PDF document text
    • https://cdn.sqhk.co/vemikozoj/hyghjZt/7606324248.pdfIn PDF document text
    • http://lovechat24.club/24049848153rpxis.pdfIn PDF document text
    • http://topstop.site/mevuvimojikiyccxd.pdfIn PDF document text
    • http://info-pages.ru/lajaliwexatovebaxuki81by.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/ms_sql_dba_interview_questions.pdfIn PDF document text
    • http://lifeshop.pro/earn_free_airtime_kenya7lr4v.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/c1iaX9C/lezadewonubomopojefejumip.pdfIn PDF document text
    • http://tortomsk.ru/77328149417ijllb.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/bohaty_tata_chudy_tata.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/what_order_should_you_read_the_star_wars_books.pdfIn PDF document text
    • http://rineset.xyz/what_to_read_after_handmaids_taleydgpl.pdfIn PDF document text
    • http://zanartcc.net/27394373031j9ht7.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/davolazupivowi/2502148987.pdfIn PDF document text
    • http://giwalawap.epizy.com/how_to_draw_symbols_in_word.pdfIn PDF document text
    • http://wafowudu.epizy.com/new_bhojpuri_dance_dj_song.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/botany_tamil_books_free_download.pdfIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/chikku_bukku_song_bgm.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/42839524379.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/90194807584.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/62599054385.pdfIn PDF document text
    • http://bukevixu.epizy.com/grohe_kitchen_tap_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/bosch_india_annual_report_2014-_15.pdfIn PDF document text
    • http://wozowopug.rf.gd/call_apps_for_pc_free.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 5948 bytes
SHA-256: e970d4825c115c4a270a2780c3f74a8c7f0f99e208d63213ab36719f15b83052
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 10828 bytes
SHA-256: f0a356f5049b00ae8feb7b5aa9d94579a5986e02e0fcedfd06bd1117a9a91c91

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