Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4163def9cd6069e…

MALICIOUS

PDF

92.0 KB Created: 2021-05-03 00:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 64ed70e9b1e9d2639f5c6b9df84ac46e SHA-1: db9cda8d9aa97abee78e877a812be2bb5cc1b22c SHA-256: a4163def9cd6069eadbf4ce0a50f78584a4145fec0181223cfa88613d23f4dc2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL, likely intended to trick the user into visiting a malicious site for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL https://nipisod.ru/strik?utm_term=how+to+brew+john+palmer+amazon is a primary indicator of this phishing attempt.

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://nipisod.ru/strik?utm_term=how+to+brew+john+palmer+amazon PDF link annotation
    • https://cdn.sqhk.co/sumexasov/BFXihic/xugan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_6040ada557dec.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/jvFjijc/can_i_color_my_tape_in_extensions.pdfIn PDF document text
    • https://cdn.sqhk.co/dawolesirip/7gfBghx/68593221162.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/i72jMDD/krieg_der_titanen_schauspieler.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/bQWjiwZ/guess_the_disney_theme_song_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_602b3a7aa6a74.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/QibidIZ/super_sandbox_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_60544252104c0.pdfIn PDF document text
    • http://robolab.one/linda_s_costanzo_physiology_free_downloadlraho.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6017b68820397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_6064e3dd3cc37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_602ef0e7ab8bd.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/geShegd/digital_school_bell_system.pdfIn PDF document text
    • http://discount50.pro/aquatic_ecosystem_sort1rxe5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21073141-4b5e-44f1-9bb2-7a697744a630/nixowaferusogusufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023a1a37-0ec6-405b-bc0d-6a755f4e0b59/91341077649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bec563e-9b1f-407b-9b1a-d8d71267190b/behringer_xenyx_x2222usb_mixer_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7459d44e-b167-4376-b2db-d09819599fdb/diluzufumupuwumuvaza.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 5200 bytes
SHA-256: c7fef8c6da0d17990192d9b7ba4f526ff9a65d715652b10a5f2d87d6310e4a6e
font_01_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 12440 bytes
SHA-256: e63bfd944ac485f81a7dadc4eb33e66675efa7fabb32b7adf2bdefdc23765ac9

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