Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c86b7fe57b4d224…

MALICIOUS

PDF

77.7 KB Created: 2021-04-01 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0c7fefb3e2e2d9db1a04422ab4bc2ef5 SHA-1: e9b8a3e7a288002df393fc1642376e9b95cb636b SHA-256: 4c86b7fe57b4d224de416257daf202c9fde283b0bfce939e79f55a89ae882a04
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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://resalured.ru/wix?keyword=bill+nye+evolution+video+worksheet+answer+key PDF link annotation
    • http://pewujok.mypressonline.com/rumegekemogavevagerazudik.pdfIn PDF document text
    • http://avto-document.site/what_is_the_language_of_visual_basicrn8ih.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/QjagjrA/king_of_fighters_2002_arcade_cheats.pdfIn PDF document text
    • https://mewirolubeb.weebly.com/uploads/1/3/4/4/134446630/8511198.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/57524032513.pdfIn PDF document text
    • http://instapodarok.site/warhammer_40k_current_codex_listaiud3.pdfIn PDF document text
    • https://zajosozuxisofe.weebly.com/uploads/1/3/1/4/131407459/5542591.pdfIn PDF document text
    • http://kayikciakademi.com/sanigesimomcblx.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/jebejotowiril.pdfIn PDF document text
    • http://itawegan.space/wunepuwut2xl0.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/jggDjDQ/78493499928.pdfIn PDF document text
    • http://lynciguest.com/13928727793tvjzo.pdfIn PDF document text
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/100878.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/iOEIheR/new_movie_counter_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/HidWibQ/xozegisuwisidarox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/678e4a1d-08ad-488f-8377-b2ef9d1badc1/81218252546.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_2a731e743ba24d138460a32839724942.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_6b7f57047a3e426e8d9fc22947e4727a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef34dbe0-fd29-40f9-bff1-9ffb40d62a7b/necchi_sewing_machine_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caaefafc-c2b5-4709-a049-bb40bdd9a3ca/31078150825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e6cf08-8e94-4d0c-a2f2-248fee3d2226/head_first_python_reddit.pdfIn PDF document text
    • http://roveramo.atwebpages.com/adjective_suffixes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313b1773-1338-47b3-81a6-588c295a6a5e/namelukedolitutifatako.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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 5280 bytes
SHA-256: a6d9742cdec1b8cf2bacfd0b532d73bdd52fd2d2fc1e615534387516916e4031
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11588 bytes
SHA-256: 3c10a3636b12dca65de180c8f49870c3457b679a2b993001ae76bb06aa915a10

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