Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ce853ff2162fa0…

MALICIOUS

PDF

72.2 KB Created: 2021-01-19 11:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f82ad00afc5b7a403ca15b872c0a746d SHA-1: f39f9de7769c4a55679bd41bfd23acac8138b3a0 SHA-256: 03ce853ff2162fa00448ccc3083c3e2c0bc50dfb17e3ccffa1d4c94a3dda75e9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'https://crophysi.ru/wb?keyword=math%20blaster%20hyperblast%202%20free%20online'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous links suggests a broad attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wb?keyword=math%20blaster%20hyperblast%202%20free%20online In PDF document text
    • https://site-1174607.mozfiles.com/files/1174607/facebook_logo_aesthetic_black.pdfIn PDF document text
    • https://site-1193425.mozfiles.com/files/1193425/57019518559.pdfIn PDF document text
    • https://site-1174959.mozfiles.com/files/1174959/cloud_9_ranch_prices.pdfIn PDF document text
    • https://site-1179780.mozfiles.com/files/1179780/46324601760.pdfIn PDF document text
    • https://site-1243712.mozfiles.com/files/1243712/ligue_1_fifa_20_guide.pdfIn PDF document text
    • https://site-1193591.mozfiles.com/files/1193591/mapa_amsterdam_imprimir.pdfIn PDF document text
    • https://site-1083588.mozfiles.com/files/1083588/descargar_terapia_intensiva_sati.pdfIn PDF document text
    • https://site-1199805.mozfiles.com/files/1199805/aice_general_paper_study_guide.pdfIn PDF document text
    • https://site-1172169.mozfiles.com/files/1172169/stock_inventory_report_format.pdfIn PDF document text
    • https://site-1175829.mozfiles.com/files/1175829/jebazijopesoxezewupifimi.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/72455469850.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/ieCgcjb/rabbit_s_magic_adventures.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/limeri.pdfIn PDF document text
    • https://site-1174788.mozfiles.com/files/1174788/english_worksheets_past_simple_and_past_continuous.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/muvemasoxaji/wulabure.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 5368 bytes
SHA-256: a29bc32397e41086cecbf1eaffbcfaba92f06ce8a8ac152b7bb72ce3bcc7625f
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 10160 bytes
SHA-256: 607251e163fde21fa22d11bbf7bf5de5604e81cf7c8df629600d457054158a20

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