Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f675824ab9cc717…

MALICIOUS

PDF

79.7 KB Created: 2021-03-06 03:43:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 072268f69583a51564e732297051624e SHA-1: bb4afc2ad5256bfbf4cc9af33b232a0e5f77ec7c SHA-256: 5f675824ab9cc71755c4dc3c11a409e6afc51e967e421eee6968f388353074d0
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0'. It contains an embedded URI pointing to 'https://zajinet.ru/123?utm_term=we+were+liars+summary+plot', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a book summary, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=we+were+liars+summary+plot
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fc978480e169.pdf
    • https://cdn-cms.f-static.net/uploads/4382429/normal_6036525067eee.pdf
    • https://bumozirejukije.weebly.com/uploads/1/3/5/3/135340746/2354764.pdf
    • http://setovewurepenu.22web.org/77493807271.pdf
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/difotilasunuxov-wupilavazoja-fidage-bobudepusuroz.pdf
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/38c09bb2b.pdf
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fe8255193.pdf
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/miwofeg.pdf
    • http://legendbilisim.com/hitchhiker_s_guide_to_the_galaxy_robotrj08y.pdf
    • http://openchambre.xyz/automation_testing_interview_questions_toolsqaoyf12.pdf
    • http://gerisekazaleg.22web.org/legacy_of_discord_vip_guide.pdf
    • http://sdek-24.cc/medical_history_and_physical_exam_notebookugw3f.pdf
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/kofuve.pdf
    • https://cdn-cms.f-static.net/uploads/4390330/normal_6015d39b994fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jovunalinuz.rf.gd/24485921256.pdf
    • http://vagaxalelevirot.epizy.com/periodic_table_aqa_a_level.pdf
    • http://suwagovi.epizy.com/danizajepaxada.pdf
    • https://uploads.strikinglycdn.com/files/3bac795e-ee57-440e-aaf0-2a80666075cc/the_anatomy_of_story.pdf
    • http://kabemetuva.rf.gd/joomla_3._8._12_free_templates.pdf
    • http://zatupux.rf.gd/who_owns_coleman_furnaces.pdf
    • https://uploads.strikinglycdn.com/files/76f5f30a-76ee-497c-9db9-a7e75b0128a9/how_to_reset_the_kenmore_elite_dishwasher.pdf
    • http://fasekefap.epizy.com/biometricprompt_android_example.pdf
    • http://nimozan.epizy.com/33925810997.pdf
    • https://uploads.strikinglycdn.com/files/2a886ddb-f000-425f-918e-d8004fd36cb6/voborinulenerilufujidi.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_off0000fb94.bin
dc999e8b9f9708df748d59b015c105730f5959ff2673c5e65192c5f59b0d2e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 5172 bytes
font_01_sfnt_off00010d31.bin
05d4bac83b6c8373e375d1a7ff00e10027c241ce069836a28c156eba5443b0e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10536 bytes

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