Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d87c76cc2c241c2…

MALICIOUS

PDF

82.3 KB Created: 2021-02-18 15:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c7d79adfc9195dfd5559cc724e5f85ac SHA-1: 9725228e3436d880542f19f47712f0efcef5458d SHA-256: 7d87c76cc2c241c2a34a5f0ef9fd6bd912896a21facdf4917a7d28d3f399bc6c
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. Static analysis and ML classification strongly indicate malicious intent. The embedded URL, 'https://leonvi.ru/strik?utm_term=windtunnel+2+whole+house+rewind+pet+bagless+vacuum+cleaner', is likely used to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and embedded URI are sufficient indicators of a phishing lure.

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://leonvi.ru/strik?utm_term=windtunnel+2+whole+house+rewind+pet+bagless+vacuum+cleaner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456391/normal_600f8a4704895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fd78a918e79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5fe8549dcdfa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fd62874642f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_60111521ae80c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449014/normal_600441a67e3ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5fdda3ea5e8d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_600fca9d015bf.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/litunux/10416361970.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/86667470528.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/adventure_time_game_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/zoxalikomafise.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/flannelette_cot_sheets_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/xuderufure.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/99286017314.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/zofija.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/41432851474.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/dota_auto_chess_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/aankh_mare_simba_song_pagalworld_320kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/martin_lutero_95_tesis_resumen.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_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 5924 bytes
SHA-256: 4924615fbd94e191355562318e57285f4d06c587fe1b3109e1a31f0cf7a6912d
font_01_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 10884 bytes
SHA-256: ef1f6006aeb396ffa29b57085280b455ed37b0cc67859f46fb12e653509d4a6c

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