Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1b62bc2ee6b0fd…

MALICIOUS

PDF

87.0 KB Created: 2021-03-16 12:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a65e09728902fb458fe467ff80fa3011 SHA-1: 3842acc22504709eab2a910279fed130f64f590b SHA-256: 3f1b62bc2ee6b0fd9ebb61e844eb45e23854024ad54b2b54d7e1a45b37a3d0c1
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a malicious domain, likely intended to host phishing content or a further payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=best+app+for+learning+korean+vocabulary
    • http://juraxoxodas.scienceontheweb.net/your_brain_at_work_david_rock.pdf
    • http://farozemirig.scienceontheweb.net/james_and_the_giant_peach_online_book_free.pdf
    • http://allieshouseofhope.com/brighthouse_financial_change_of_ownership_formq74c6.pdf
    • http://winefesa.22web.org/nitekerozavu.pdf
    • http://chisto-chisto52.ru/286193947443w8yw.pdf
    • http://gbo.guru/how_big_is_jupiters_storm_compared_to_earthl5i8l.pdf
    • http://stalekost.site/avogadro_hypothesis5cxsw.pdf
    • http://copyrightnotice-ig.com/627623812235ssyg.pdf
    • http://cesaregaspari.com/ruremuduk49bkn.pdf
    • http://hyipinvest.site/nothing_stops_a_bullet_like_a_job_is_the_slogan_ofkys28.pdf
    • http://youtube-subscribes.com/asi_hablo_zaratustra_audiolibro_espaol5f46r.pdf
    • http://strahuemsya.info/unicorn_sheet_cake_designsb52cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufaxoferugod/singer_brilliance_6160_erro_c4.pdf
    • https://uploads.strikinglycdn.com/files/1fbd2ca8-eecf-43ef-a764-870943fbd284/setowuvasabexoposawixib.pdf
    • https://uploads.strikinglycdn.com/files/d41dd875-5533-4997-b328-ad558673025b/what_is_the_marine_corps_philosophy_of_leadership_based_upon.pdf
    • https://uploads.strikinglycdn.com/files/8235e69a-0cdd-433a-bb65-09bb628e526a/uniden_phone_answering_machine_not_working.pdf
    • https://s3.amazonaws.com/xomudufe/naneborufituwararepoli.pdf
    • https://uploads.strikinglycdn.com/files/87a863c8-09ff-4454-a5ac-6c4107171527/how_to_reset_waste_ink_pad_counter_for_epson_l805.pdf
    • http://sogisujomixugo.epizy.com/autecology_and_synecology.pdf
    • https://uploads.strikinglycdn.com/files/5c669ed2-1547-4658-9d38-94a8fedfcb20/cuntas_caloras_se_debe_consumir_al_da.pdf
    • https://s3.amazonaws.com/jarirotexab/80282918572.pdf
    • https://s3.amazonaws.com/nademopor/37996304513.pdf
    • https://s3.amazonaws.com/fizaxo/verbos_irregulares_en_ingles_y_espaol_mas_usados.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_off000113d9.bin
18ca157fd9143720b5e13a5587ad778908d0006c2fc27dc25549459288911d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 5600 bytes
font_01_sfnt_off0001270b.bin
5cc47ae8a6e7d73bf5ade4e38309b0cccd36d06541550efdb1e3722d55adb52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 11868 bytes

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