Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d50ef4b029f862…

MALICIOUS

PDF

78.2 KB Created: 2021-05-01 03:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7debba43cc44498c9f3c6e2793f28008 SHA-1: 90ba120c002de0f62b012301c4633f08cb3f0e09 SHA-256: c8d50ef4b029f8624d8fc3722173836c58fdfd2748361333e188a70641f54b97
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious URL, identified by both heuristics and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to writing a book. The presence of external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is leveraged to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=how+to+write+a+book+beginners
    • http://openlait.pro/what_is_another_word_for_study_against_the_law2smi4.pdf
    • http://mogimetekojubar.scienceontheweb.net/capital_structure_arbitrage.pdf
    • https://cdn.sqhk.co/masunidupag/hdijgcP/1955910717.pdf
    • http://zopokujejisolan.getenjoyment.net/xejiporomivenokukikefu.pdf
    • http://artrosil.xyz/where_to_find_an_interior_designerh3czq.pdf
    • https://cdn.sqhk.co/lopovekis/fQibgdz/guardian_tales_guide_world_1_lost_girl.pdf
    • https://cdn.sqhk.co/disegivoji/XkYnXZB/migamatanukawizid.pdf
    • https://cdn.sqhk.co/temirikuji/hfNw6oy/teaching_strategies_gold_objectives_2020.pdf
    • http://xoziduso.mypressonline.com/74889885886.pdf
    • http://handler-autoscout24.com/88095685123bwrkg.pdf
    • https://cdn.sqhk.co/furigelo/giiYIhg/22476917204.pdf
    • https://cdn.sqhk.co/beratinuga/yCxrUia/xarifexuwuzafewozizewib.pdf
    • https://cdn.sqhk.co/janurisu/PKagdib/retro_games_emulator_online.pdf
    • https://cdn.sqhk.co/porosobof/wOifVgc/download_stick_fighting_battle_champion_mod_apk.pdf
    • http://4escam-bot.online/gumafuwefadegap6we0.pdf
    • https://cdn.sqhk.co/zewezerezi/nvyhhjh/toon_blast_ice_ice_baby.pdf
    • http://lunesygets.xyz/what_causes_surface_ocean_currents_to_be_deflected6d2b7.pdf
    • https://cdn.sqhk.co/sevijeruba/z2Bhany/xajulovuwaluvuwebe.pdf
    • http://bazunujovi.scienceontheweb.net/resegu.pdf
    • http://nalodorepuwag.getenjoyment.net/kagatiluxunerozi.pdf
    • https://cdn.sqhk.co/molavagew/31ieDNr/fugikepawuzutugalerirudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rawesaragegugar/75230792178.pdf
    • https://s3.amazonaws.com/sorapobuk/the_best_way_to_test_the_software_project_management_plan_spmp_is_by.pdf
    • https://s3.amazonaws.com/kigavanus/texifilamugaj.pdf
    • https://s3.amazonaws.com/wenobagupexekap/games_for_samsung_smart_tv_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57b.bin
53f9afbc1f89f448dbc24a012b123524e3782feef252bdceb72a9e5a7a278d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 5076 bytes
font_01_sfnt_off000106e1.bin
0ba531faf9fe02a08c5b48b1a5af9c599683a080217144c6b665f708fc11a847		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 10620 bytes

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