Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f31de8769b1b1ac…

MALICIOUS

PDF

91.0 KB Created: 2021-03-01 06:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee3d9479eede7408107761dcb715c7e7 SHA-1: 23adbb3b12a725c531a39e241a011237d76aba5a SHA-256: 9f31de8769b1b1acf89eb42df11d3d37c43894ef32eb4b4f61f75821397712c8
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the ML classification strongly suggest the PDF is intended to lure users to malicious websites, likely for credential harvesting or malware distribution.

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
  • 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/123?utm_term=heal+wounds+quotes PDF link annotation
    • https://murimuwisoruda.weebly.com/uploads/1/3/4/0/134017177/9c78c.pdfIn PDF document text
    • http://tolebexeju.22web.org/xezitokiwefol.pdfIn PDF document text
    • http://small-italy.space/biniturigoxaz2wot.pdfIn PDF document text
    • http://vugadabupujexax.22web.org/devexpress_report_designer_add_dataset.pdfIn PDF document text
    • http://montana-media.com/8500299008173qvx.pdfIn PDF document text
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/1985087.pdfIn PDF document text
    • http://itash.space/95750121264i6e04.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/fgi3jgc/notisimiterugubezesizako.pdfIn PDF document text
    • http://callipakk2.site/building_inspection_report_template_australiaj5jqz.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/ijRjbgc/coupons_for_mcdonalds_oct_2020.pdfIn PDF document text
    • http://seluluxafej.22web.org/website_footer_html_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/qiaihBx/hills_of_steel_game_install.pdfIn PDF document text
    • http://airned.ru/merkury_wireless_headphoneslti8l.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/nexivakijimalipemo.pdfIn PDF document text
    • http://my-favshoph.online/zokefunomabafewoe4b7l.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/jcNha4o/sub4sub_get_more_subscribers_views_free.pdfIn PDF document text
    • http://yesnutural.space/169889459541wk0y.pdfIn PDF document text
    • http://fherixq.com/68068294085u3ey8.pdfIn PDF document text
    • http://prodson.space/nefowenezoa75zr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutakeba.epizy.com/77873168406.pdfIn PDF document text
    • http://jatujij.rf.gd/nedizivelanuralopunoli.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_off00012965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 4904 bytes
SHA-256: 6322953f73154ea1a1ad6039c1710c67186b8b06e40ff4372f6a8b72378c84d8
font_01_sfnt_off00013a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 10952 bytes
SHA-256: 0efc94f0999915bd47e84b22f352a3b71fb0d38e3e0c887187c3d5c351c7e566

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