Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b57f18dbc00974b…

MALICIOUS

PDF

96.6 KB Created: 2021-01-11 01:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 55fa29751240e79696988a508459aa9b SHA-1: b841075dba41dad500ef8641021121a42bf5fab7 SHA-256: 2b57f18dbc00974b8ccf4d93d32d54aaa4ff55cd1076b9913c45c413f543a533
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely serves as a lure, directing users to a link farm that may host phishing pages or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/123?utm_term=kamen+rider+gatack+zecter In PDF document text
    • https://cdn.sqhk.co/xawodoze/jjgbFj3/76927679048.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/gehbdrt/87831097043.pdfIn PDF document text
    • https://site-1178204.mozfiles.com/files/1178204/robots_vs_tanks_5v5_tactical_multiplayer_battleship.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/ansi_encoding_format.pdfIn PDF document text
    • https://site-1180194.mozfiles.com/files/1180194/nozuramavo.pdfIn PDF document text
    • https://site-1172039.mozfiles.com/files/1172039/verizon_safe_wifi_review_2019.pdfIn PDF document text
    • https://site-1192612.mozfiles.com/files/1192612/55070010790.pdfIn PDF document text
    • https://site-1180408.mozfiles.com/files/1180408/how_to_raise_a_gifted_child_book.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/atjavvo/lamelerisexopexajuve.pdfIn PDF document text
    • https://site-1182802.mozfiles.com/files/1182802/cbse_class_9_science_syllabus.pdfIn PDF document text
    • https://site-1193467.mozfiles.com/files/1193467/c_compiler_ideone.pdfIn PDF document text
    • https://site-1246676.mozfiles.com/files/1246676/bahubali_3_kare.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/wutezigojuxi/fefosiwufutiberodafod.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/javascript_submit_form_using_ajax.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/27443959758.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 20040 bytes
SHA-256: fe54ec8b0f21d2b9fa01d62d0d11f6acae610f6d710ea336c53a75f19afde1be
font_01_sfnt_off00013da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 5132 bytes
SHA-256: 59eac9af43c7d7e4a82a1304250f393538472b102c97049abc6ad939f5102152
font_02_sfnt_off00014f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 11412 bytes
SHA-256: 4ee0d863dc6fb34064bfaec87a5aba690668f38ab1e09a40e0b8b01072c3e171

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