Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37fb8272a965b3f…

MALICIOUS

PDF

79.7 KB Created: 2021-04-05 03:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eb6236f33398481c452e3d203421dfff SHA-1: afd42196822eca863d4d4fe5e05f568c57cb478f SHA-256: f37fb8272a965b3f7395444b95644bc2e462c4675bfa72f860d166da618c5104
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=bits+pilani+placement+report+2018 PDF link annotation
    • http://f13x.xyz/57794120588n33op.pdfIn PDF document text
    • https://toxuweraf.weebly.com/uploads/1/3/4/1/134108638/vexuje_latitapuvivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489028/normal_6063e48d1968b.pdfIn PDF document text
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/e5e10b.pdfIn PDF document text
    • http://nigasheff.xyz/receitas_de_caipirinhabrnr9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_6041de22c3e5c.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_5ffb18036b13b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_602e6e996db6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5fcb24f73dc51.pdfIn PDF document text
    • https://degovemidim.weebly.com/uploads/1/3/4/0/134017519/5542825.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/42ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_605130680f207.pdfIn PDF document text
    • http://dupamineni.medianewsonline.com/the_lord_of_the_rings_the_fellowship_of_the_ring_extended_edition_vs_theatrical.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5ff66813f0df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_606090b994379.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/auditing_and_assurance_notes.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/nakevoja/xosibefizukerasozifaza.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/gikakovaja.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/89355923968.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_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 5436 bytes
SHA-256: d9b3f797b2f4c9e15879928ad4ada046dc4257300e8a189a8d807cc66580f711
font_01_sfnt_off0000fc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 11116 bytes
SHA-256: 284c5b06e17e3c01ccf482eccfa14f89760a38565ad1f58caf198b75c899971d
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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