Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf39b2cbcbce5976…

MALICIOUS

PDF

79.0 KB Created: 2021-02-27 05:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d00af6b2de872eeedea2aca215438c0d SHA-1: 4b835f0e5aa91c8d8100f7a4514893648965247f SHA-256: bf39b2cbcbce5976dde14510ddf7ff9de77ecd6461af26fc469c1c8b69392fa0
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 containing an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily garbled, appears to contain text related to a product name, suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=line+6+spider+v+120+vs+240 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fcd9e9b45b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5fe713942c573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_60251982b5994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5ffda0e9b7f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_6029a25110716.pdfIn PDF document text
    • http://requiremcgood.com/meramfezuh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_6005753f17722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410211/normal_5fe2ea097593a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468553/normal_5fdf5095916ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedexim/alloy_625_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/battletoads_nes_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/knights_chronicle_kristian_advent_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/bandini_serial_all_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/kemisegodim.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/esmo_breast_cancer_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/afghan_jalebi_song_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/concierto_de_aranjuez_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/mastering_astronomy_lab_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/dranetz_hdpq_guide_sp.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/how_to_remove_battery_from_kidde_carbon_monoxide_detector.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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 5280 bytes
SHA-256: 731ab79e4d53d581a6c8910bd00687cfdd43f1aa307e102038f8a0ce32f8f50b
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10136 bytes
SHA-256: 72625f6477794e655e62bb804414bd084d8e24de7d8313c156d9e569fcfd218f

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