Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96545a0d48efbf9…

MALICIOUS

PDF

78.6 KB Created: 2021-04-21 12:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42d2af0f42eb8967af0b1b088fed03ff SHA-1: 2cfc82dd7ee46c760ee27f1701de8f016084b73e SHA-256: a96545a0d48efbf9ff0bec2eea4256e752e96b85113e00a03b191064a49125ef
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains embedded URLs, one of which, 'https://jacksth.ru/strik?utm_term=what+is+boundary+testing', is directly referenced in the heuristics. The document body, though heavily obfuscated, suggests a lure related to 'boundary testing'. The presence of multiple unknown URLs indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jacksth.ru/strik?utm_term=what+is+boundary+testing
    • http://xefopuro.mypressonline.com/fetesavokinoke.pdf
    • http://kadaxejob.mypressonline.com/wepajagesovigimezujenuja.pdf
    • https://cdn.sqhk.co/merojuniv/jjgchfB/crossroads_trading_berkeley.pdf
    • http://jexekiraj.sportsontheweb.net/dawamom.pdf
    • http://naturelofo.mypressonline.com/understanding_business_finance.pdf
    • http://pupezawat.scienceontheweb.net/do_you_get_holiday_pay_on_leave_of_absence.pdf
    • http://dinewegivogofe.mygamesonline.org/circle_geometry_theorems_worksheets.pdf
    • http://allostar.buzz/oppo_r15_launch_date_in_indiaf7xo6.pdf
    • https://cdn.sqhk.co/guzufaseba/g21qjdi/88721515666.pdf
    • https://cdn.sqhk.co/jifibipex/hgjhdja/build_a_bear_frog_tiktok.pdf
    • https://cdn.sqhk.co/danopefasuf/Vjgjbie/sight_reading_trainer_app.pdf
    • http://zanovekolasin.mywebcommunity.org/78536567532.pdf
    • http://lerob.info/ruwazanupamew065l.pdf
    • http://4kuhd.me/957066665537r9x1.pdf
    • http://xoroketogejuxe.mywebcommunity.org/lavet.pdf
    • https://cdn.sqhk.co/malevevipali/jseObih/greatest_hits_radio_liverpool_presenters.pdf
    • http://muzoc.xyz/the_little_girl_and_the_wolffvl4z.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kezemiradigu/84776899755.pdf
    • https://s3.amazonaws.com/retobifulipo/bajenisiled.pdf
    • https://s3.amazonaws.com/legesiliv/anemia_ferropenica_diagnostico_y_tratamiento.pdf
    • https://s3.amazonaws.com/mikibetiv/10142439543.pdf
    • https://s3.amazonaws.com/jirebonudur/53466260842.pdf
    • http://kabuzore.atwebpages.com/boxes_and_bullets_organizer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e830.bin
e9db971355e1df65c62213edd7669bca4cde791b9cf4ad4f1d8c1f686978c9f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 5192 bytes
font_01_sfnt_off0000f9d3.bin
4de4f2702e4510e5534a04a4224e163fce47ceca5654aefc538f198ef3c002c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10964 bytes
font_02_sfnt_off00011f11.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 4324 bytes

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