Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a866d96decf12e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 18:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5d32d9de10ce06bd69c4d42f5cb90571 SHA-1: f6bfe80f0476b9c436323141daabec046a1f542f SHA-256: 99a866d96decf12e30f064e07005e618ab63fd023b54988866958917a4b53db4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/123?utm_term=doen%25C3%25A7a+de+chagas+formas+de+transmiss%25C3%25A3o PDF link annotation
    • http://help-bluebadgecustomer.com/70481402385zngoy.pdfIn PDF document text
    • http://good-production20.site/absalom_and_achitophel_as_a_politicahg30w.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/tRzhfhj/92946731305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_60145b4980b1d.pdfIn PDF document text
    • http://summerita.fun/8565795317cly6j.pdfIn PDF document text
    • http://italywow.pro/clasificacion_de_las_cuentas_por_pagar_a_corto_y_largo_plazo7fm6y.pdfIn PDF document text
    • http://pexaxasub.iblogger.org/41596901969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465914/normal_5fed120c636ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_60089b1ae4965.pdfIn PDF document text
    • http://yesitalia.fun/135557388741x5bh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488604/normal_5fd795561c371.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/hcdiXib/disney_getaway_blast_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/bJ7igzD/21347709943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_600b72d3072c7.pdfIn PDF document text
    • http://constructionhouse.info/jasikegezuvutofupireraskgoo7.pdfIn PDF document text
    • http://alcexpress1.xyz/humminbird_helix_5_si_gps_owners_manualbucqu.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/giAyhbH/45615483740.pdfIn PDF document text
    • http://perekon.22web.org/39768060440.pdfIn PDF document text
    • http://bupetud.xyz/148578496101jcza.pdfIn PDF document text
    • http://wediwutesifetuw.iblogger.org/are_lg_washer_pedestals_interchangeable.pdfIn PDF document text
    • http://helpforteam.com/971671134718wyxr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefelogo.epizy.com/xakimofexodebemeg.pdfIn PDF document text
    • http://fukekixejup.epizy.com/83784262525.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_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 5900 bytes
SHA-256: 3624e56a43e2adad66aa20d309e6986ffc081a5e98a2f151fc13156dd98a49fa
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 13848 bytes
SHA-256: ce78a3eab0b1619b41baed21223e71048b7748b877c40264e10b0d5ee01c8ad4

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