Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88c7c7379d04416…

MALICIOUS

PDF

79.7 KB Created: 2021-05-12 11:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c788dee496031085e4f829968791280f SHA-1: f083c5d8b408d5a83b78a450f2ad5fc2519d65e6 SHA-256: c88c7c7379d044165752ca14bbada7ed2c2a6f73491f31794417fe91c0e92fe5
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL 'https://ponafet.ru/strik?utm_term=linking+verbs+worksheet+5th+grade+pdf' suggests a phishing lure disguised as an educational worksheet. While no scripts were explicitly extracted, the PDF structure and the presence of external URLs are common in phishing campaigns that aim to trick users into downloading further malicious content or revealing sensitive information.

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
  • 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://ponafet.ru/strik?utm_term=linking+verbs+worksheet+5th+grade+pdf PDF link annotation
    • http://wativeb.mypressonline.com/cadena_perpetua_en_colombia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_604f5ee957695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_60160427479a2.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/nodiretilovumibukino.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/52878c1a-3c4d-4f1f-8603-37d94cce8a1c/vacinas_que_mais_doem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72644e3-3eaa-4f1b-b92a-bd6c2a592898/what_is_the_other_name_of_sensory_neuron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706c8bc0-e46b-462a-9e7d-c06a2b771d39/how_to_write_a_synthesis_essay_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f7603a-7593-4b13-9a48-4a369eaf2455/goxuvigab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbc7c46-13d6-4533-a5b9-74a1b97942dc/canteen_boy_alec_baldwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9401fff7-4f84-4406-9ff0-2a027a14fa02/wd_my_cloud_home_8tb_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef693560-e9f9-45b3-aeb7-0d9af2214b5a/among_the_barons_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4bd181-8c0d-4199-97b3-d1e096cf24d9/durugane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69a0460-a6d4-4c50-b181-6c1d73b313dc/olympus_om-d_em1_mark_ii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9743b92c-5483-49d2-9083-16663f462c77/best_deals_on_weber_natural_gas_grills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62186efd-fc62-485f-97be-de6d773d78a3/4_words_game_level_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/744c09d0-86e2-416c-bb00-a3630a191207/26482443255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205f1489-ffa8-4031-a8f8-7f8897340c81/is_netgear_ac1600_compatible_with_xfinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfbe17b-7b3e-4721-9d0d-a98541a01b52/fedidoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3d380c-1617-4982-ad82-ca53b38d7576/american_red_cross_jobs_memphis_tn.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5480 bytes
SHA-256: 2486a089bef9ab65ea7013863aad13f4ef67bae22cc2fa631840008107e7095a
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 11420 bytes
SHA-256: 997431c68ce4ad52cf54df15908ce1c09ea5b60120255331bc6828ac9fa73636
font_02_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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