Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93ca66f4ddb22ce…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 21:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9b21735ab04dae6543b8e8bdf80ea923 SHA-1: a437830cc1aa6e5c76f779d1c2912e72bd3a2bbf SHA-256: c93ca66f4ddb22ce86345221fc03a837151ebff6703e701883fc31e5a4ea8361
224 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to suspicious and disposable domains, with some specifically identified as redirectors to malicious infrastructure. The presence of invisible links and the overall structure suggest a phishing or malware delivery attempt, likely leveraging a PDF exploit to achieve initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/123?utm_term=golf+buddy+watch+aim+w10+review In PDF document text
    • http://reduslim-europa.site/xobovoremulozivaxv6ba1.pdfIn PDF document text
    • http://loginwithfb.site/wemokosofimenomsgwg5.pdfIn PDF document text
    • http://luchdobro.site/top_5_cordless_vacuum_cleanersbiz52.pdfIn PDF document text
    • http://fruit-italy.space/wikipedia_founder_social_network5a1pv.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/gdifvhb/22835289701.pdfIn PDF document text
    • http://ig-mediateam.net/19365914367q8h07.pdfIn PDF document text
    • http://the-english-temple.com/greensleeves_violin_dueterxwu.pdfIn PDF document text
    • http://znasila.ru/education_psyche_reading_answers_ieltssh5xr.pdfIn PDF document text
    • http://talakam.space/17784966398wsl4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fakuzilezozo.epizy.com/pibodexizusipen.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/vanity_fair_movies_2020.pdfIn PDF document text
    • http://wabiredozu.rf.gd/servo_stabilizer_circuit_diagram.pdfIn PDF document text
    • http://wovotunuvovon.epizy.com/carta_aos_romanos_hernandes_dias_lopes.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 5480 bytes
SHA-256: 175a800cb8ce12fe1398466f2b8990374d8c3c6fa416d7780c229e9c412ae9ac
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10720 bytes
SHA-256: ee044214a3d36d937764c6d3e5793dd9fc300a8bb0edb244936dd9f82ffaae6d
font_02_sfnt_off000119e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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