Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdf7ec80b96230d…

MALICIOUS

PDF

80.2 KB Created: 2021-03-31 07:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65ec56f2b327ae8a688f65e86f8b777d SHA-1: 7813e6ffa1a15fff7a66b905085965e6c25ecdf7 SHA-256: ecdf7ec80b96230d0f04951f9bc3fa132c5d3af8f7e65bd4c31d6fbe5b38a991
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, likely for a scam. While no scripts were extracted, the presence of external URLs suggests a potential download or redirection mechanism. The ML classifier's high confidence score and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/123?utm_term=where+to+buy+brownies+uniform+near+me
    • https://cdn.sqhk.co/majukedow/ihqeIje/dilations_on_the_coordinate_plane_worksheet_answers.pdf
    • https://cdn.sqhk.co/wogesowive/ijpJdEx/63293705425.pdf
    • https://cdn.sqhk.co/fidapulano/KggOifL/slot_machine_games_ipad.pdf
    • https://cdn.sqhk.co/mixaluwekitu/jjdheev/35396419374.pdf
    • https://cdn.sqhk.co/dojidavos/eRvifhc/71980243304.pdf
    • https://cdn.sqhk.co/muvasesuru/gZthh5E/kefinid.pdf
    • https://cdn.sqhk.co/kusamika/b6hfBqr/bicycle_track_racing_events.pdf
    • https://cdn.sqhk.co/benibavagoge/idgdBii/dinudajopizufijafobuwagon.pdf
    • http://vagijuderotogur.22web.org/british_airways_cabin_crew_new_uniform.pdf
    • https://cdn.sqhk.co/mamevugixej/e0eKloR/affirmative_action_programs_examples.pdf
    • http://vakekaninu.iblogger.org/airtel_live_tv_app_java.pdf
    • https://cdn.sqhk.co/pisomuma/ihhdhg8/22758182220.pdf
    • https://cdn.sqhk.co/gegojagakexu/egj0Bge/online_mobile_recharge_idea.pdf
    • https://cdn.sqhk.co/sajatanugeg/CGhh3C9/gather_round_homeschool_curriculum_review.pdf
    • http://gemosugobez.22web.org/37118304703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dojeranorered.epizy.com/50199842415.pdf
    • https://s3.amazonaws.com/sojaxub/how_to_set_an_intermatic_dt620_astronomic_timer.pdf
    • http://zagopemolal.rf.gd/55180201791.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/what_is_shear_strength_of_beams.pdf
    • http://kewagar.epizy.com/sizawefam.pdf
    • https://s3.amazonaws.com/jovekus/drupal_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/todo_sobre_el_texto_argumentativo.pdf
    • http://xufizup.rf.gd/boy_scout_store_tulsa_oklahoma.pdf
    • http://bivagunipekuja.rf.gd/35646486230.pdf
    • http://defefefesid.rf.gd/stoelting_s_anesthesia_and_coexisting_disease_7th_edition_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_off0000f8c9.bin
b5bb88984829f2bb99f149cc8db6c09bb83512867924d05c6708e4d396ca36c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 5320 bytes
font_01_sfnt_off00010ad3.bin
385976ff36d2cf7aadb51188ccc0aca63ed3fa8743fdb1a918c88761a73a63c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 11260 bytes

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