Malicious PDF — malware analysis report

Static analysis result for SHA-256 8592c71745638cbb…

MALICIOUS

PDF

71.4 KB Created: 2021-02-18 15:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dcf04541d7879b92fdd0d110a37d294b SHA-1: fce0d315e3e78c8984109c8591f015353a74b538 SHA-256: 8592c71745638cbb9cf50688659f41764f52f47c3fa3e1782ad163c559d03c7f
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, flagged as malicious redirectors. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a lure to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://yafferge.ru/strik?utm_term=williams+wall+furnace+thermostat+wiring+diagram In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388835/normal_5fc81965cdbff.pdfIn PDF document text
    • http://copyrightprivacy.site/revenge_of_stickman_warriors_apk_modflnnz.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/wipalupopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5fe39194e43c7.pdfIn PDF document text
    • http://pro-konditer.com/physics_equation_sheet_a_level_ocr6t387.pdfIn PDF document text
    • http://hookup158.fun/magurovemodigofazoui454.pdfIn PDF document text
    • http://umniashka.ru/helen_mirren_acting_masterclass_downloadvnj8v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_60271a5517e0b.pdfIn PDF document text
    • http://artdebug.site/star_trek_voyager_episode_kes_leaveszt3dg.pdfIn PDF document text
    • http://front-glass.space/the_great_indian_diet_free1u6wf.pdfIn PDF document text
    • http://skidki-day.shop/tierra_mestiza_partitura_flautawetwe.pdfIn PDF document text
    • http://naturwows.space/company_profile_indesign_template_freeephst.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
    • https://s3.amazonaws.com/tiduro/circular_economy_eu.pdfIn PDF document text
    • http://ligixuz.rf.gd/xikasixawitorevexozuvu.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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 5424 bytes
SHA-256: 3dacb63e7f2fb7ff8bdd896835bb374bab465ddc29dadd367fa9a46ced87b967
font_01_sfnt_off0000e0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 9844 bytes
SHA-256: d692e2340ee7e2fde4cfc1442a19304535e88249902ecb4d33ba417bbb45c4a9
font_02_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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